W. H. W. Komp.
A New Culex, Culex vomerifer, from Panama (Dipt., Culicidae).
Psyche 39(3):79-82, 1932.

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A New Culex from Panama
79
A NEW CULEX, CULEX VOMERIFER, FROM PANAMA (DIPT., CULICIDB)
Incidental to other duties in connection with malaria in- vestigations in the plantations of the United Fruit Com- pany at Almirante, Panama, the writer made collections of the local Culicidze as time permitted. Among the many rare and beautiful forms taken a new species of Culex was found. It is a Mochlostvrax, belonging to the section Choeroporpa, and like most of this group, is a small brown unmarked mosquito, not to be differentiated in any way from dozens of other species of the same group. Nothing is known of the life-history or of the immature stages. The description follows :
Culex vomerifer sp. nov.
Female : Unknown.
Male: A small brown Culex, with rather wide pale bands at the bases of the abdominal segments.
Legs all black.
Palpi with the last two joints exceeding the proboscis, and clothed with rather long stiff hairs. Terminalia of male: Side-piece rather conically produced, bearing a lobe. Outer lobe undivided, bearing the following appendages : the most mesial is a long simple filament with a sharply recurved terminal hook. Then in order are a small flattened filament about two-thirds the length of the preceding hooked fila- ment. Next in order is a long, sharply acuminate filament, bent at nearly a right angle at one-half its length; this fila- ment is laterally expanded at the bend, with the edges of the expansion directed inwards, forming a cup-shaped hol- low in the angle of the filament. Next in order is a flattened filament, just exceeding the bend of the long preceding fila- 'Sanitary Engineer, U. S. Public Health Service. From the Gorgas Memorial Laboratory, Panama City, Panama.



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80 PSYC~~ [September
ment. Then comes a small slightly flattened filament, with tip somewhat broader than the insertion. Arising from a separate point of insertion in the outer lobe, and most dorsal in position, is a heavily sclerotized appendage, nearly as long as the mesial hooked filament. This appendage is bent upwards from the point of insertion to about one-third its length, then downwards to two-thirds FIG. 1.
Culex vwnerifer sp. nov., male terminalia, ninth tergite and tenth sternite.
its length, and then is produced in line with its insertion. The tip of this appendage is flattened dorso-ventrally, thick, and bluntly pointed. A thin membranous expansion arises from a point near the insertion of this appendage, and is attached a11 along the dorsal edge, to a point about two- thirds the length of the appendage. This flattened mem- brane is somewhat incurved. The outer border of the mem- brane is sinuous, the edge arising abruptly from the point of attachment at the proximal end of the appendage, to its greatest elevation about one-third of the length, then curv-



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19321 A New cdex from Panama 81
ing downwards to form another elevated portion about three-fifths of its greatest height, then curving abruptly down to the distal end of its attachment to the appendage, which is at about two-thirds the length of this appendage. The membrane is an expansion of the dorsal border of the appendage. The appendage? with its membranous expan- sion, resembles a plough, the heavily chitinized tip forming the share, and the membranous expansion forming the mouldboard. As this is the most prominent and striking feature of the terminalia, I have named the species from this structure.
The inner division of the lobe of the side-piece is un- divided, and bears two hooked filaments curved inwards (ventrally) at an obtuse angle. The more distal filament is somewhat longer than the other filament, and is sinuously curved? terminating in an expanded blunt tip. The shorter filament is sinuously curved? following the curve of the dis- tal filament, and terminates in a rather sharper recurved tip. At the base of the inner division of the lobe are two or three set= arising from conically produced bases. The clasper is membranous, not much expanded, with pointed tip and appendiculate spine. A small spine arises from a protuberance on the inner aspect of the clasper, about one-fifth the distance from tip to base. The outer edge of the clasper is membranous, with rough torn irreg- ~dar free margin. Two strong set= about one-third the length of the clasper, arise from the angle between the clasper and the base of the outer lobe of the side-piece. The ninth tergites are small, mound-like, rather heavily sclerotized, and are joined by a smooth bar about as long as the width of one of the tergites. The tips of the tergites are smooth, but the bases are clothed with long stiff set= aris- ing from protuberant bases.
The inner plates of the mesosome are T-shaped, the ends of the cross-pin of the T being produced to form sharp horn-like tips, which are directed mesially. The dorsal tip of the T is longer, thinner, and sharper than the ventral tip. The basal hooks are rather wide and membranous. The tenth sternites are rather short, with seven or eight blunt teeth, which are long in proportion to the length of the entire sternite.




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