33 



Mar.,,9°9] FaLL : SYNOPSIS OF OCHOD.EUS. 



tervals than in the greater number of species. The length as given 

 by LeConte is 8 mm. ; by Horn 5-6.5 mm., but it must be remem- 

 bered that the measurements of the latter author extend from the ante- 

 rior margin of the prothorax to the tip of the elytra only. 



The species is known from Texas, New Mexico, Colorado and 

 Nevada. 

 4. 0. planifrons Schaef., Can. Ent., 1906, p. 269. 



In the single male example at hand, the elytral striae are feebly im- 

 pressed, the intervals nearby flat and the strial punctures but little 

 larger than those of the intervals. The mentum is deeply longitudi- 

 nally impressed, the channel of nearly equal width throughout. Ac- 

 cording to Schaeffer the female differs from the male in having the 

 hind tibiae simple, the hind femora with a smaller and more obtuse 

 apical tooth, and the clypeus slightly broader. The species is of ave- 

 rage size ; it occurs in the Huachuca Mts. of southern Arizona. 

 5. 0. ulkei Horn, Trans. Am. Ent. Soc, 1876, p. 182. 



This species was described from a single specimen from Nevada in 

 the Ulke collection, and I have not been able to obtain an example. 

 There is in the LeConte collection a New Mexican specimen placed 

 beside the ulkei label which I suspect is the real thing. It has the 

 simple head and nearly parallel propygidial lines as described by Horn, 

 and the hind tibi^ are obtusely angulate on the lower edge behind the 

 middle (said in the description to be slightly dilated at the middle). 

 In common with the two preceding species, the elytral striae are feeble 

 and unusually finely punctate. The longitudinal impression of the 

 mentum is - very deep, the angles elevated when viewed from beneath 

 and the tip not perceptibly emarginate." Horn gives the length as 

 5 mm. 



6. 0. musculus Say {Balboceras), Boston Jour., 1837, p. 178. 

 Opacus Lee, 9, Trans. Am. Ent. Soc, 1868, p. 51- 

 A^nericanus Westw., Trans. Ent. Soc. London, Ser. II, 2, p. 66. 

 There are no characters of importance to add to those used in the 

 synoptic table. The species is of medium size and of a rather dark 

 ferruginous brown color when mature. It is a well known species of 

 more eastern range than any other -if we except the Florida record 

 for /r^;//a/u- and with this exception is the only species that has 

 occurred east of the Mississippi. Horn records it from Michigan, 

 Dakota and Nebraska ; it is known to me also from western Indiana, 

 Illinois, Kansas and Manitoba (Winnipeg). 



