190 Zoologica: N. Y. Zoological Society [III; 6 



acute process of first abdominal sternite, which fits into median 

 notch in metasternum. First ventral abdominal segment with 

 coxal lines very fine, short, curved, becoming almost parallel 

 behind, but not reaching posterior margin ; four following 

 sternites each slightly shorter than the first, the last rounded 

 apically, concave beneath, with carinate posterior margin. Legs 

 short, stout, femora incrassate, first three tarsal joints inflated, 

 hairy beneath, fourth small but distinct, fifth joint as long as the 

 three basal joints together. Genotype: Coccidot7-ophus socialis 

 sp. nov. 



This genus is so unlike other Silvanids known to us that its 

 true affinity was not recognized until Dr. Boving's studies of its 

 larva proved it to agree well with typical Silvanid larvge and not 

 to be related to Hapalips, with which we were trying to associate 

 the adults. Once suggested this relationship was readily confirmed 

 by the characters used by Ganglbauer (Die Kafer von Mitteleu- 

 ropa, 1889, vol. 3, p. 577) to distinguish the adults of this family: 

 front coxal cavities closed behind, metepimeron reaching middle 

 coxae, etc. 



We cannot identify Coccidotrophus with any of the genera 

 considered by Grouvelle (Ann. Soc. Ent. Fr., vol. 81, 1912, pp. 

 313-386), but it seems most nearly to approach Synoemis Pascoe 

 (1866), the only species of which was described from the Malayan 

 Peninsula. 



Coccidotrophus socialis sp. nov. 

 (Plate VI, figs. 1 to 5). 



Very elongate, parallel, depressed, shining, castaneous, 

 glabrous (except for sparse, microscropical, decumbent 

 pubescence) . 



Length, 3.5-4.5 ; width, 0.6-0.8 mm. 



Habitat — British Guiana. 



Head slightly wider than prothorax, widest at the very 

 slightly prominent eyes, one-sixth longer than wide, feebly 

 constricted into a neck in basal fourth, sides convergent in front, 

 front margin broadly, shallowly notched; upper surface finely 

 granulose except a small occipital smooth area, feebly convex, 

 transversely somewhat tumid between and behind eyes, which 



