86 GEO. H. HORN, M. D. 



Occurs from San Diego to Owen's Valley, California, and flies in 



the early evening. 



ODONTONYX Gue'r. 



Head vertical, retracted, resting in repose against the prosternum 

 which is flattened to the front, frontal suture absent. Eyes round, 

 moderately prominent, partly concealed by the angles of the thorax. 

 Antennae feebly serrate, second joint small. Labrum transverse, arcu- 

 ate in front, partly concealing the mandibles which are robust, not 

 prominent nor acutely margined above. Mentum transverse, narrowed 

 in front, ligula prominent with four slender ciliate lobes. Maxillary 

 palpi longer than the labial, both with the terminal joint securiform. 

 Prosternum vertical in front, prolonged between the coxae, terminating 

 in a point meeting the mesosternum. Anterior coxse conical and more 

 prominent than the prosternum, with large trochantin. Mesosternum 

 moderately separating the coxse, arcuate and sulcate. Metasternum 

 moderately long, side pieces wide, the epimera small. Posterior coxae 

 "•radually dilated within, very narrowly separated. Abdominal seg- 

 ments nearly equal. Legs moderate, anterior and middle tibiae slightly 

 compressed, tibial spurs distinct but small. Tarsi slender. Claws pecti- 

 nate. Onychium wanting. (PI. I, fig. 13). 



The form of the claws is unique in the family. 



O. trivittis Germ. — Oblong oval, parallel at middle, piceous pubescent. 

 Head punctate. Thorax a little more than twice as wide as long, arcuately 

 narrowed to the apex, base bisinuate, sides acutely margined, disc convex, 

 finely punctured, color reddish-yellow with two large black spaces, the pubes- 

 cence the color of the surface. Scutellum yellow. Elytra very little wider 

 than the thorax, substriate, stri» punctured, intervals densely punctate-scab- 

 rous, surface clothed with brownish hair with cinereous vittse. Body beneath 

 and legs black, densely finely punctulate, clothed with _short brownish hair. 

 Length .32— .36 inch; 8—9 mm. 



Occurs in the Middle States. 



ANCHYTARSUS Gue'r. 

 Head deflexed but not retracted against the prosternum. An- 

 tennse slender, as long as half the body. Mouth as in Odontoivjx. 

 Prosternum moderately long in front of the cox^, horizontal, pro- 

 longed between them and slightly extending posteriorly, coxae oval, 

 more prominent than the prosternum, trochantin large. Mesosternum 

 narrowly separating the middle coxae, notched at its anterior border, 

 the coxae with distinct trochantin. Metasternum moderate, side 

 pieces moderately wide, epimera small. Posterior coxae moderate- 

 ly dilated within, separated by a narrow intercoxal process. Seg- 

 ments of abdomen equal, fifth a little longer. Legs moderate, tibiae 



