R. I. Wilson.
The Male Genital Tube of the Amphizoidae.
Psyche 35(2):98-99, 1928.

This article at Hindawi Publishing: https://doi.org/10.1155/1928/38082
CEC's scan of this article: http://psyche.entclub.org/pdf/35/35-098.pdf, 120K
This landing page: http://psyche.entclub.org/35/35-098.html

The following unprocessed text is extracted automatically from the PDF file, and is likely to be both incomplete and full of errors. Please consult the PDF file for the complete article.

98 Psyche [June
THE MALE GENITAL TUBE OF THE AMPHIZOID^E1 When Sharp and Muir (12) prepared their work on "The Anatomy of The Male Genital Tube in the Coleoptera" they were unable to procure specimens of the family Amphizoidse. Since this family is one of the intermediate groups between the Carabidse and the Hydrophilidae, figures of the sedoeagus will be Fig. 1-Aedceagus of Amphizoa insolens Lee. from a lateral view 2 pdceagus of Amphisou lecontei Matth. same view; 3, aedceagus of Amphisoa striata Van ~ ~ k e . of interest. The material was collected by Mr. P. J. Darlington during the summer of 1927. It includes the three species known from the Western United States, Amphizoa insolens Lee., A. lecontei Matth., and A. striata Van Dyke. The aedceagus of Amphizoa is closely related to that of Pelobiidse and Halipidse, The median lobe (ML) is a simple 'Contribution from the Entomological Laboratory of the Bussey Institu- tion, Harvard University, No. 294.
Pu&e 35:98-99 (1928). hup ttpsychu einclub orgtW35-@I8 html



================================================================================

19281 The Male Genital Tube of the Arnphizoidce 99 cylindrical tube with a large median orifice(M0) extending the greater part of the length of the ventral side, internal sack (IS) simple and undifferentiated. The lateral lobes (LL) are large, produced, and coming together to form an articulation with the median lobe on the
dorsal side.
When retracted into the ab-
domen the sedceagus lies on its left side. The basal plate (BP) is small, attached to the lateral lobes by a short membrane, and rides over the lateral lobes. The structure of the sedoeagi of the three species varies only in details of size and shape of the median lobe, the lateral lobes, and the basal plate. The sedoeagus of the Caraboidea Series is of two types, the less specialized being characterized by an undifferentiated in- ternal sac. The Pelobiidse, Halipidse, Dytiscidse, and Amphi- zoidse possess such a simple sac. From a comparison of the figures by Sharp and Muir the Amphizoid sedceagus seems to be more closely related to the Pelobiidse in the structure of the basal plate, and the size and shape of the lateral and median lobes.
The general shape of the Amphizoid sedoeagus resembles that of Dactylosternum subdepressum Cast. which belongs to the Byrrhoid series of Sharp and Muir. In Dactylosternum the lateral lobes meet on the ventral surface, while in Amphizoa they meet and articulate with the median lobe on the dorsal surface. The basal piece in Dactylosternum is chitinized entirely, in Amphizoa the basal piece is not chitinized on the dorsal surface. This resemblance in shape then is only a superficial one.



================================================================================