PROC. ENT. SOC. WASH., VOL. 23, NO. 9, DEC., 1921 207 



found. This is the sixth species to be described in the genus 

 Desmocerus, five of these belong to the Pacific fauna, and one is 

 found throughout the eastern and southern states. 



Desmocerus dimorphus, new species. 



Male. Elongate, moderately convex and strongly attenuate posteriorly, 

 head, antennae, pronotum, underside and legs black; elytra dull orange colored 

 in pinned specimens (bright orange when living); each elytron with an oblong 

 oblique bluish-black space just behind the humeral umbone. 



Head rather large, strongly obliquely narrowed behind the eyes and deeply, 

 longitudinally grooved on the vertex, the groove extending between the anten- 

 nae to the front; surface coarsely, deeply and confluently punctate and sparsely 

 clothed with long cinereous hairs; antennae with joints three, four and five con- 

 siderably enlarged at the inner apical angles. Pronotum one and one-halt times 

 as wide as long, distinctly narrower in front than behind, strongly transversely 

 constricted along the anterior margin and with a feeble transverse depression in 

 front of scutellum; sides strongly obliquely diverging from anterior angles to a 

 feeble, round tubercle at middle, then strongly sinuate and nearly parallel to 

 posterior angles, which are acute and somewhat projecting; base nearly truncate 

 with a broadly rounded lobe in front of scutellum; surface coarsely, deeply and 

 confluently punctate and sparsely clothed with inconspicuous cinereous pubes- 

 cence, the hairs becoming much longer towards the sides. Scutellum oblong, 

 black and densely clothed with velvety black pubescence. Elytra wider than 

 pronotum at base, humeral angles rounded, strongly, regularly attenuate to 

 apical sixth, then broadly rounded to the apex, which is feebly truncate; each 

 elytron strongly bilobed at base; humeral umbones well developed; surface 

 deeply and densely punctate, the punctures becoming smaller and more con- 

 fused towards the apex, sparsely clothed with short inconspicuous hairs; inter- 

 vals smooth. Beneath rather strongly punctate, somewhat rugose and rather 

 densely clothed with long recumbent cinereous pubescence. 



Length 15 mm.; width at base of pronotum 5.5 mm. 



Female. Elongate, moderately convex and parallel, head, antennae, pro- 

 notum, underside and legs black; elytra dull black with the margins of a dull 

 orange color in the pinned specimens (bright orange when living). 



Head and pronotum similar to the male; antennae with joints three, four and 

 five regularly enlarged at both apical angles. Elytra distinctly wider than 

 pronotum at base, humeral angles rounded; sides parallel to apical sixth, then 

 broadly rounded to apex, which is very feebly truncate; surface opaque, more 

 densely punctured than in the male; intervals finely granulated. Body beneath 

 similar to that of the male. 



Length 18 mm.; width 6.5 mm. 



Type Locality. Sacramento, California. 



Type, allotype and paratypes. Cat. No. 24678, U. S. Nat. 

 Mus. 



Described from four specimens, two males and two females, 

 received from Mr. J. S. Wade and collected by Mr. B. G. 

 Thompson at Sacramento, California, during May and June, 



