Hazel Andrews.
A New Ant of the Genus Messor from Colorado.
Psyche 23(3):81-83, 1916.

This article at Hindawi Publishing: https://doi.org/10.1155/1916/46260
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19161 AndreweNew Ant oj the Genus Memw 81 PARASITES OF ARCHIPS CERASIVORANA FITCH. While collecting at Bennington, Vt.? from June 18-24? 1915? I found the webs of the Ch,erry-tree Ugly-nest Tortricid (Archips cerasivorana) quite abundant on the wild cherry along the hedge rows. Bringing home six of the nests to ascertain to what extent they were parasitized? the following insects emerged between July 6 and 12. Moths 30%. Dipterous parasites: Dichdoneura leucop- tera Johns. 104 and Neopales tortricis Coq. 2. Hymenopterous parasites: Bassus agilis Cress, 6, and Labrorychus prismaticus Nort. 26. The latter was also bred in considerable numbers from the same species at Winchendon, Mass., by the late Dr. F. W, Russell. Itoplecti~ (Pimpla) conquisitor Say. was bred from nests taken by the writer at Milford, N. H., July 5,1914. I am indebted .
to Mr. H, L. Viereck for the determination of the Hymenopterous parasites.
C. IV. JOHNSON.
A NEW ANT OF THE GENUS MESSOR FROM COLORADO. BY HAZEL ANDR.EWS,
University of ~olorado, Boulder, Colo.
A few years ago Prof. T. D. A. Cockerel1 collected four workers of this ant at Glenwood Springs, Co10.~ not noticing at the time that they were anything unusual. Recently? while working on the genera Messor, Aplzomogaster, and Pogonomyrmex, we found these specimens mixed with the series of Pogonomyrmex occidentalis which they superficially resemble. . It was evident that they could not belong to Pogonomyrmex, on account of the impressed dorsal suture and other characters, and on looking up the literature we failed to find any similar species described. Dr. W. M. Wheeler, who kindly examined a specimen confirms the species as new, and considers that it must be referred to Messor rather than Aph~no- gaster. He further notes that it presents some characters suggest- ing that it may, in a certain sense, be regarded as intermediate between Messor and P~~onornyrmex.




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[June
Messor lobognathus sp. nov.
Worker: ,Length, about 6 mm.
Head quadrate, about as wide
as long, excluding mandibles. Posterior corners of head rounded, vertex almost straight, sides almost straight and parallel. Surface of head with sparse hairs, rugose, with rug= posteriorly divergent; interrugal spaces distinctly reticulate. Clypeus very short with rugose surface, ridges irregular; shallowly emarginate anteriorly. Mandibles stout and convex, peculiarly lobed apically, with two large apical teeth and five to seven rudimentary teeth; surface coarsely striated. Eyes moderate, at sides of head, about half way between clypeus and vertex. Antennz 12-jointed, hairy; scape compressed and dilated at base, hardly extending beyond corners of head; last four joints of funiculus incrassate, but hardly form- Fig. 1.
~llessor lobogna~lzz~s sp. nov.
Lateral view and anterior view of head,
ing a distinct club.
First joint longer than second, but not twice as long.
Pronounced beard of recurved hairs, as in Pogonompnex. Thorax slender, irregularly rugose, sparsely clothed dorsally with long, glistening, light yellow hairs. Pro- and meso-notum convex. Thoracic dorsum deeply impressed at rnesoepinotal suture: meso- epinotal suture distinct. Spines of epinotum acute, much longer than broad at base; divergent; striations radiating from the base; infraspinal cavity smooth. Petiole punctate with a few hairs; longer than wide; ventral surface straight in profile; a high pos- teriorly placed superior node; apex broader than base; posterior slope abrupt; anterior slope long and gentle. Postpetiole narrow at base, a little longer than wide when seen in profile; superiorly convex and sides rounded. Thus the postpetiole is globose. Gaster shining, scarcely larger than head, with delicate microscopic re- ticulate sculpture on apical part of segments. Sting vestigial. Legs quite long; posterior tibia1 spurs spinulose.



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