88 GEO. H. HORN, M. D. 



Four % , one 9 , collected by H. K. Morrison, in western Nevada, 

 the specimen with luteous elytra was given me by Mr. H. Edwards, 

 who collected it at Shasta, California. 



AR^OPUS Lee. 



Head deflexed, in repose resting against the prosternum which is 

 very short before the coxae and vertical in front, concealed from 

 above by a slight prolongation of the thorax. Frontal suture distinct, 

 clypeus partly membranous in front. Antennae but little longer than 

 the head and thorax, first joint obconical, second short, 3 — 10 sub- 

 serrate, as broad as long, eleventh a little longer and more slender. 

 Eyes round, not prominent. Labrum transverse, rounded in I'ront. 

 Mandibles not prominent. Mentum transverse, narrowed in front. 

 Ligula with four slender ciliate appendages, the palpi short with the 

 last joint triangular. Last joint of maxillary palpi elongate triangular. 

 Prosternum short in front of the coxae and vertical for the reception 

 of the head, narrowly prolonged between the coxae terminating in an 

 obtuse point meeting the mesosternum. Anterior coxae conical, more 

 prominent than the prosternum and with a large trochantin. Meso- 

 sternum oblique, separating the coxae moderately, triangularly emar- 

 ginate in front. Metasternum moderate, side pieces wide, epimera 

 small. Posterior cosas gradually dilated within and contiguous. Seg- 

 ments 1 — 4 of abdomen nearly equal, fifth a little longer. Legs 

 moderate, tibiae with small spurs. Tarsi slender, simple, joints 1 — 4 

 gradually decreasing, fifth as long as the preceding three, without 

 onychium and with simple claws. 



This genus is closely allied to the three which precede, especially 

 Odontoni/x, although difi"ering in many of its details. The thoracic 

 margin is more completely obliterated than any of the preceding 

 genera, and the anterior margin is arcuate forming a hood concealing 

 completely the head from above. 



A. monacltiis Lee. — Oblong, browuish, very feebly shining, moderately 

 densely clothed with brownish-yellow pubescence. Head densely punctured. 

 Thorax wider than long, much narrowed in front, apex oval and overhanging 

 the head, base bisinuate, margin very obtusely rounded, disc convex, densely 

 punctured, a fovea at base on each side of the scutellum. Elytra a little wider 

 than the thorax, gradually but feebly wider to behind the middle then gradu- 

 ally narrowed tn tip, surface feebly striate, the sutural deeply impressed near 

 the base, strise finely [)unctured, intervals densely punctulate. Body beneath 

 densely punctulate, abdominal segments 1 — 4 with a distinct impression pos- 

 teriorly close to and parallel with the sutures. Length .40 inch; 10 mm. 

 (PI. I, fig. 5). 



Occurs in Oregon. 



