Volume III, Number b 



DESCRIPTIONS OF NEW SPECIES OF 

 COLEOPTERA 



By E. A. SCHWARZ and H. S. Barber 



United States Department of Agriculture 



Specimens of three species of beetles from Kartabo, Bartica 

 District, British Guiana, have been submitted to us by their 

 discoverer. Dr. W. M. Wheeler, for identification. Two of the 

 species belong to the family Silvanidae, vi^hile the third is an incon- 

 spicuous species of the ubiquitous Coccinellid genus Scymnus. 

 The two first are, however, very interesting forms, and it has 

 been necessary to erect a new genus to receive the larger and 

 more abundant species. These, Dr. Wheeler informs us, were 

 occupying the petioles of a tree (Tachigalia). 



Coccidotrophus gen. nov. (Silvanidje), 



Eyes small, not emarginate, not prominent, occupying 

 middle fourth of side of head. Antennae inserted laterally, in 

 deep cavity between frontal margin and prominent gena, close 

 to and equidistant from base of mandible and front margin of 

 eye; compactly eleven-jointed, club not abruptly enlarged, all 

 joints traverse except basal joint; joints 3-9 rapidly increasing 

 in size, the three- jointed club densely covered with fine short 

 hairs. Antennal grooves short, distinct, parallel, bordered by 

 lower edge of eye and carina from gena. Mouthparts free, maxil- 

 lary palpi four-jointed, labial palpi three-jointed. Elytra with 

 ateral costa and nine distinct series of strial punctures, 

 'ygidium usually covered by elytra when abdomen is con- 

 racted (when distended the pygidium is often exposed), 

 itercoxal process of prosternum about one-seventh as 

 ide as prothorax, wider behind, its sides overlapping the 

 limera; front coxae separated from hind margin of pro- 

 tl.orax by about their own length. Intercoxal process of 

 mesosternum slightly narrower than that of prosternum, truncate 

 apically and nearly reaching hind margin of coxae, metepimeron 

 reaching the middle coxae. Hind coxae separated by strong, 



