174 J. L. LECONTE, M. D. 



10. X. sangninipennis. — Slender, shining black, antennse legs and 

 elytra ferruginous, the last strongly but sparsely punctured. Head oblong, 

 one-half wider than long, hind angles rounded, upper surface with large 

 scattered punctures, and an undefined frontal smooth space; frontal and ocular 

 grooves very short, under surface punctured like the upper one, without trace 

 of lateral groove or margin. Prothorax one-half longer than wide, angles 

 rounded, sides parallel; dorsal series 10 — 12 punctured, with some confused 

 punctures near the base and tip; lateral series irregular in one specimen, regu- 

 lar in two, about 8 — 10 punctured, with scattered punctures near the front 

 angles. Dorsal segments piceous, finely not densely punctured; ventral seg- 

 ments rufo-piceous, similarly punctured. Length 6 mm. 



Pennsylvania; I have examined three specimens. 



13. X, nanus. — Closely resembles X. Aamaties, but differs by the shorter 

 frontal grooves, by the gular sutures being eflf;iced, and the under surface of 

 the head being smooth between the punctures instead of finely strigose. There 

 are also some large punctures, between the dorsal and lateral series of the 

 prothorax, which cause the lateral series to appear irregular. The elytra 

 are more strongly punctured, and the punctures are not arranged in series. 

 Length 4 mm, 



San Diego, Cala. ; one specimen. In the characters above given 

 this species resembles Leptacinus paUidulus^ but the last joint of the 

 maxillary palpi is distinctly conical and not acicular. 



I.ATHROBIUM Grav. 



Prothorax uniformly punctured with distinct smooth dorsal line; elytra 

 densely punctured, front tibise dilated and obliquely grooved on inner side: 

 sixth ventral prolonged behind in J; -^ sixth ventral truncate, seventh 

 broadly divided; front thighs thickened and armed with a tooth, or sinuate 

 on the lower margin 2. 



Prothorax (except in politum), with dorsal series of close set punctures, sides 

 sparsely jjunctured; elytra punctured more or less regularly in rows; head 

 usually very sparsely punctured, sides parallel behind the eyes, base and hind 

 angles rounded, sometimes nearly truncate; front angles of prothorax more 

 distinct than in the species of the other groups, sometimes scarcely rounded; 

 hind tarsi with second joint not longer, or scarcely longer than the first. 

 Front tibise not dilated, and but feebly grooved on_the inner side; front thighs 

 thickened, not sinuate nor toothed on lower margin 11. 



Prothorax with very narrow dorsal line, punctures uniform; elytra densely 

 punctured; e])ipleurse without marginal stria;* second joint of hind tarsi not 

 much longer than the first; front tibise obliquely sulcate near the base to fit 

 the obtuse tooth of the front thighs; % sixth ventral slightly prolonged at the 

 iniddle; seventh widely divided into two broad triangular valves; 10 mm.: 

 Northern States ]. grande. 



* In all the other s^iecies the epipleurse have a distinct stria near the extreme 

 margin, in addition to the line which separates them from the dorsal part of 

 the elytra. 



