81 



Length, 5™" ; breadtli, 1.52'"™ ; length of head, .pi'""" ; breadth of same, 

 .90""" ; length of prothorax, 1.12'"'"-; breadth of same, 1.24™"- ; length of 

 elytra, 2.85™'"; breadth of same, .76"™-; length of antennre, l.G™™- ; of 

 sixth joint of same, .13"™- 



13. " Corymhites velatits. — A single specimen, with its reverse, was found 

 by Mr. Eichardsoii west of the Green Eiver crossing, Wyoming. The 

 head and prothorax are gone, but both upper and under surface of the 

 rest of the body, including the elytra, may be seen in each impression 

 with nearly equal distinctness. The insect appears to have been about 

 the size of C. mediamis (Germ.), but more closely allied in form to G. 

 splendens (Ziegl.). The legs have been destroyed, but the middle and 

 hind coxal cavities may be seen. The elytra are of the length 

 of the abdomen, acutely angled, almost pointed at the tip, and 

 furnished near the outer edge with a broad and shallow furrow, whose 

 outer limit is abrupt and thus well marked. Besides this the elytra are 

 faintly and distantly striate, with five or six rows of striae, and the meso- 

 and meta-sternum are very delicately granulate. 



Length of fragment, G ""■"'; breadth, 3™™; distance between anterior 

 edges of middle and hind coxae, 1.75™™. 



14. Oxygonus mortuus. — A single elytron, and its reverse, were ob- 

 tained by Professor Denton, at Fossil CaSon, White Eiver. It is slen- 

 der, the humeral angle well rounded, the outer edge apparently a little 

 marginate; it is almost equal until near the tip, when it tapers to a 

 point. This peculiarity leads me to refer it to Oxygonus, although the 

 apex is not produced so much as in recent species of that group. It is 

 furnished with eight equidistant, rather strongly-impressed but deli- 

 cate strife, that nearest the suture almost incroaching upon the margin ; 

 these striae are equidistant anteriorly and in the middle, but posteriorly 

 they converge toward each other. 



Length of elytron, 4.55™™; breadth, 1.72™'^; distance of striae apart, 



Omm. 



15. ChcmUognatJius 2)ristinus. — A single specimen, with its reverse, 

 was obtained by Mr. T. L. Mead at Castello's ranch, South Park, Colo- 

 rado. It is very fairly preserved, and presents a dorsal view of the 

 insect, with the left elytron and wing partially expanded. The head is 

 rather small, rounded, the front extending considerably beyond the 

 large eyes. The antennae are about as long as the elytra, and appar- 

 ently consist ot twelve joints, most or all of which are similar to one 

 another, cylindrical, about three times as long as broad, and scarcely 

 smaller at the basal than at the distal extremity. The prothorax is 

 small, scarcely larger than the head, the anterior border rounded. The 

 elytra are slender, square at the shoulder, each independently rounded 

 and slightly tapering at the apex, not reaching the tip of the abdomen. 

 The abdomen, which tapers posteriorly, appears, however, to be un- 

 nahirally produced ; more than four segments can be counted beyond 

 the unexpanded elytron. The wings are as long only as the elytra; 

 the legs are slender, but- the tarsi are indistinguishable. But for the 

 brevity of the elytra, there would be little doubt that this insect should 

 be referred to CJianlioynafhus. It has the general appearance, also, of 

 i\ MaJtliiiius or n Jfidtliodcs, hut the wings are not exposed when the 

 elytra are closed, and the insect is much larger than the livitig species 

 of these genera. Hecr has described, from Oeningen and Eadoboj, 

 several Telephoridic, but none so large as this, unless it be his Tele- 

 phonis Germarii. Our species has much the ge.neral ai)pearance of his 

 figure of Lytfa JEscuhipli, but the structure of the antennie forbids its 

 reference to that group. 



Xo. 1 G 



