NATURAL SCIENCES OF PHILADELPHIA. 379 



but has only two thoracic tubercles, which are less elevated than in Au. 

 pa rallelopi pedum, though more distinct than in Au. ae q u i c o 1 1 e. 

 The striae of the elytra are composed of finer punctures than in these spe- 

 cies, though a little more distinct than in Au. tuberculatum. 



SYNCHITA Hellwig. 



S. 1 a t i c o 1 1 i s Ditoma latieollis Lee. New spec, p. 66. 



The specimen which served as the type of the description had lost the an- 

 tennae, but so resembled in form, sculpture and coloration, our common D. 

 quadriguttatum, that I had no hesitation in referring it to the same 

 genus. I have since obtained a more perfect specimen, and find that the club 

 of the antennae is solid ; as the antennae are not received in grooves, I have 

 placed the species in Synchita. An approach to the Ditoma-like sculpture is 

 seen in S. v a r i e gata Lee, but less decided than in the species in question. 



NAUSIBIUS Redt. 



N. repandus, linearis, depressus, fusco-piceus, subtiliter pubescens, 

 capite thoraceque confertim punctatis, illo lateribus baud reflexis, hoc lati- 

 tudine longiore, lateribus repandis, disco ante basin vix impresso ; elytris 

 confertim minus subtiliter seriatim punctatis, interstitiis angustis, vix elevatis ; 

 suhtus fortiter punctatus. Long. 3-5 mm. 



Mr. Ulke has found at "Washington, D. C, several specimens of Nausibius 

 differing from N. d e n t a t u s by the smaller size, narrower form, and much 

 stronger sculpture; the upper surface of the head is uniformly and slightly 

 convex, not depressed and reflexed at the sides as in the last named species ; 

 the sides of the thorax are not toothed in outline ; the anterior angles promi- 

 nent, rounded, the hind angles acute, with four very feeble undulations be- 

 tween them. The tooth of the hind thighs is as prominent as in N. d e n t a t u 8. 



LATHROPUS Er. 



A species of this genus has bpen found abundantly by Mr. Ulke, near 

 "Washington, D. C, which by description I cannot distinguish from the 

 European L. sepicola, except that the alternate intervals of the elytra are 

 scarcely more elevated. 



I fouud several specimens at Fort Yuma, California, differing from those 

 given me by Mr. Ulke in being brown instead of black, the sides of the 

 thorax somewhat more rounded, and more distinctly repand, and the alternate 

 intervals of the elytra distinctly more elevated. 



I am not prepared at present to discuss the value of these differences, and 

 therefore confine myself to making known the existence of the genus in North 

 America. 



Trogosita pusillima Mann., Bull. Mosc, 1843, p. 303, from Sitka, is 

 probably a species of Lathropus, but must differ, according to description, 

 by the thorax having a dorsal impressed line in addition to the lateral 

 ones. 



LiEMOPHLCEUS Lap. 



L. angustulus, linearis, subdepressus, testaceus, subtiliter pubes- 

 cens, capite thoraceque confertim punctatis, hoc latitudine fere sesqui longiore, 

 postice paulo angustato, utrinque unistriato ; elytris striatis, interstitiis uui- 

 seriatim punctatis ; antennis capite thoraceque baud longioiibus, articulis 

 tribis ultimis majoribus. Long. 2 mm. 



Washington, D. C. ; Mr. Ulke. Narrower than our other species, approach- 

 ing in form a Silvanus. The thorax is nearly one-half longer than wide, 

 tolerably densely and strongly punctured ; it is slightly narrowed behind the 

 middle, and the angles are rectangular ; the lateral stria is well marked, and 

 the disc is marked with a vague longitudinal impression. 



1866.] 



