1919.] 61 



cupreo-aeneous upper surface ; the uneven, dense, voi'ticose sculpture 

 of the prothorax and elytra, the interspaces between the punctures 

 appearing scintillate in certain lights ; the long, slender tarsi, without 

 trace of lobes on the fourth joint ; the rather broad frontal sulci ; and 

 the peculiar <S genital armature. The ventral surface of the abdomen' 

 is without definite ghibrous median space. The darker examples men- 

 tioned by Cameron belong to another sj^ecies, D. cameroni. The genital 

 armature is extruded in many of the males sent in diluted sjjirit, and is 

 therefore easily examined iu such specimens. 



12. — Dianous radiatus, n. sp. 



Black, above and beneath, the upper surface with a more or less distinct 

 brassy lustre ; shining, the abdomen, legs, and under surface finely pubescent, 

 the rest of the surface almost bare. Head broad, closely punctured, somewhat 

 depressed and deeply bisulcate between the eyes, the latter large ; antennae 

 moderately long. Prothorax narrow, slightly longer than broad, the sides 

 feebly rounded anteriorly and parallel at the base ; coarsely, irregularly, con- 

 fluently punctate, sulcate down the middle anteriorly, and with a deep, 

 oblique, outwardly-expanded groove on each side, the latter coalesceut in- 

 ward with an indeterminate basal depression. Elytra somewhat convex, 

 wider than the head, about as long as broad, rounded at the sides posteriorly ; 

 hollowed along the suture anteriorly and within the humeri, and also trans- 

 versely depressed across the middle of the disc ; coarsely, rugosely, confluently 

 punctate, the prominent rugae between the punctures sinuously or obliquely 

 radiating from the median depression. Abdomen minutely punctate, the 

 ventral segments without smoother median space ; anal brushes moderately 

 long. Tarsi with the fourth tarsal joint deeply excavate at the apex above, 

 that of the first and second pairs appearing sub-bilobed. 



c?. Fifth ventral segment feebly emargiuate, flattened in the middle 

 posteriorly, the sixth deeply triangularly notched. Genital armature (fig. 7) : 

 lateral lobes very slender to beyond the middle, and then curved, dilated, and 

 cultriform, the inner edge of this portion set with several long bristly hairs ; 

 median lobe drawn out into a slender acute point at the tip. 



Length 6-7 mm. (c?$.) 



Hah. India, W. Almora {H. G. C. -. vi.l918). 



Found in profusion, about 200 examples having been mounted for 

 study, including many males with the genital armature exposed. 

 Separable from all its alUes by the shining black or brassy-black upper 

 surface, the unusually large eyes, the coarsely punctured, uneven pro- 

 thorax, the very coarse, vorticose, radiating sculpture of the elytra, and 

 the peculiar S armature. Four specimens have a stronger brassy lustre 

 than the rest, showing a little variation in this respect. 



r2 



