1921] Schwarz and Barber: New Coleoptera 193 



organs. We are unable to distinguish the sex of the other fifteen 

 paratypes. 



Type, allotype and paratypes.— Cat. No. 24071, U. S. N. M. 

 The antennae and legs are shown in accompanying figures. 



Scymnus Kugelann 1794 (Coccinellidse) 



After some hesitation we have decided to offer the following 

 description of what appears to be a new but very commonplace 

 species of this genus, since we have failed to find any description 

 applicable thereto. It will, perhaps, be long before the multitude 

 of tropical species of Scymnus will be determinable. 



Scymnus {Diomus) xantholeucus sp. nov. 



Oval, very convex, shining, pubescent, pale yellow except 

 basal two-thirds of elytra, meso- and metasternum and median 

 third of first two abdominal segments, which are infuscate. 



Length, 1.7 mm.; width, 1.2 mm. 



Habitat. — British Guiana. 



Head and pronotum finely, rather densely punctate, elytra 

 slightly more coarsely punctured; pubescence rather dense, the 

 short, silky, suberect hairs bent in all directions forming no pat- 

 tern. Scutellum pale. Elytra piceous in basal two-thirds, apic- 

 ally flavescent, the pale area not sharply limited. Under surface 

 moderately, densely and finely punctate, the pubescence decum- 

 bent and regular. Prosternum with carinae convergent anterior- 

 ly, reaching front margin and uniting in an arc; the enclosed 

 area feebly concave and supporting moderately long hairs. Post- 

 metacoxal line as in other species of Diomus (Group A of Horn 

 1895). Penultinate abdominal sternite very broadly and feebly 

 emarginate in the male. 



Type (male), allotype and paratypes.— Cat. No. 24084, U.S.N.M. 



Described from two males and two females reared by Dr. 

 Wheeler from larvae found among coccids in company with the 

 two species of Silvanidas. 



Although not related to semiruber Casey, the foregoing 

 species is similar in shape and plan of coloration. A prescutellar 

 infuscate area is suggested in one example. 



