508 CASEY 



Vacronus n. gen. 

 While its general characters show conclusively that this genus 

 belongs in the neighborhood of Anepsius, its ver}^ slender, fili- 

 form and altogether exceptional antennae and the profound dif- 

 ferences observable in the palpi and mentum and in its large eyes 

 and scutellum, preclude any possibilit}^ of close or even tribal 

 association with it, and I am therefore forced to conclude that 

 Vacronus represents a distinct tribe, between the Anepsiini 

 and the Nyctoporini. The type may be described as follows : 



Form elongate, parallel, moderately convex, glabrous, moderately 

 shining, pale and uniform reddish-brown in color throughout ; 

 head rather small, subquadrate, the sides at the middle subangulate 

 and as prominent as the eyes, thence obliquely converging to the 

 broadly truncate apex and, posteriorly, strongly converging for a 

 short distance to the eyes, Avhich are large, convex and near the 

 base, the latter very feebly constricted ; surface broadly impressed 

 at each side anteriorly, rather finely, closely and asperulately punc- 

 tate ; antennae half as long as the body, very slender and filiform, 

 exactly equal in diameter from the base of the second joint to the 

 apex, all the joints elongate, the second the shortest, the third but 

 little longer than the fourth ; prothorax two-fifths wider than long, 

 three-fourths wider than the head and distinctly longer, parallel, 

 widest at or just before the middle, the sides subevenly, rather 

 strongly arcuate, straighter or feebly subsinuate toward the basal 

 angles, which are slightly obtuse and distinct, the base broadly, 

 very feebly arcuate, becoming transverse and straight toward the 

 angles, a little wider than the apex, which is evenly sinuate, the 

 angles rather obtuse but only slightly blunt ; surface evenly convex, 

 subexplanate near the sides, somewhat finely, very closely and con- 

 fusedly punctate, not more coarsely but more decph' and coales- 

 cently so in fine irregular rugae laterally ; scutellum transverse, 

 truncate; elytra truncate at base, almost twice as long as wide, 

 betw^een three and four times as long as the prothorax and evidently 

 wider, gradually and acutely ogival behind, the sides parallel, 

 evenly and feebly arcuate, broadly reflexed, the humeri rounded, 

 slightly exposed at base, feebly and longitudinally prominent; 

 surface finely, rather sparsely, confusedly punctured, more strongly 

 externally, the punctures, especially toward the sides, each with 

 a short carinule, not proceeding longitudinally but obliquely tangent 

 to the puncture on its antero-outward side ; abdomen minutely, 

 very sparsely punctured, more coarsely and less sparsely toward 

 the sides. I^ength 5.0 mm.; width i.S mm. California (Inde- 

 pendence), — H. F. Wickham tenuicornis n. sp. 



The single specimen in my cabinet is a female. The hind 

 wings seem to be well developed, the relationship of the genus 



