OF WASHINGTON. 105 



Leptobyrsa explanata, n. sp. 



Body short, oval in the female, more elongate in the male, shining 

 black; membranous parts of pronotum and integument of elytra pale 

 yellowish, semitranslucent, nervures yellowish. Head rather small, 

 black, with three white frontal spines, two approaching each other, 

 the middle one comparatively stouter; besides, there are two other 

 more slender spines extending from behind the eyes towards front. 

 Antennae long, finely pilose, yellowish, the tips infuscated; two basal 

 joints slightly thicker than the following ones, first joint twice the 

 length of second, third little more than three times as long as fourth. 

 Bucculae yellowish, narrow, angulate and broader behind, the edge up- 

 turned a little. Pronotum transverse, feebly convex, coarsely punc- 

 tured, and shining black; in fresh specimens the sides of pronotum 

 are covered with a whitish film that also extends toward the under- 

 side at the sternum. Hood not much inflated, cristate and slightly 

 tapering towards front; covering the head, except the eyes, with quite 

 large areoles at the sides near top and a few smaller ones at lower part. 

 The three pronotal carinse yellowish, the median one strongly foli- 

 aceous, as high as crest of hood, rounded on top and slowly declining 

 towards apex of the triangular posterior portion of pronotum, with a 

 row of long, large areoles of which the middle ones are divided by a 

 few cross nervures and embrowned; outer carinse very low, only half 

 as long as the median carina, extending from base of hood to sides 

 of pronotal portion posteriorly; the triangular part of pronotum rather 

 short, yellowish and finely reticulated ; membranous pronotal margins 

 strongly rounded behind, reflexed, widening moderately at sides, nar- 

 rowing toward the neck and reaching the lower part of hood close to 

 the eyes, with two or three rows of average-sized areoles. Elytra ovate, 

 iridescent, extending one-half their length beyond abdomen, a little 

 less in the male; strongly rounded from base to apex, broadest behind 

 the middle; discoidal area pyriform and short, angularly raised at the 

 outer nervure, somewhat rounded at apex and broadly scooped out on 

 the upper surface, with three or four rows of quite large areoles at 

 the widest part. Subcostal area subvertical, wider than the discoidal 

 area, having about five rows of irregular small areoles, those of the 

 upper row much larger; costal area broadly expanded, with four or 

 five rows of very large, more or less irregular areoles, diminishing to 

 three and two rows at base. Surface of elytra very peculiarly undu- 

 lated, with two transverse, sharp impressions, and another at apex 

 formed by the outer nervure of subcostal area ; a light transverse fascia 

 on basal half. Median nervure of subcostal area strongly sinuate 

 towards tip of elytra; sutural area at inner part irregularly reticulated 

 with rows of some extremely large areoles. Entire margin of elytra, 

 lateral margins of pronotum, crest of hood, carinse, and most of the 

 nervures beset closely with long, very fine hairs. Rostral groove un- 



