DYNASTIN.E 151 



in length to the tibiae. Length (10 c?,'i 9) 9.6-11.5 mm.; width 

 4.7-5.8 mm. Arizona (Sta. Rita Mts.), Wickham. .ovulata n. sp. 



The species of this section form a difficult study. The female 

 is frequently very rare in collections and probably has more secluded 

 habits than the male; this is particularly noticeable in the im- 

 maculata section, but is also evident throughout. The restricted 

 geographic habitat of most of the species can be inferred from the 

 localities given above; immaculata is widely distributed, however, 

 but the pubescent species, excepting pagana, seem to be restricted 

 to the regions east of the Appalachian system. I have not seen 

 pubenda Lee., and simply quote the very inadequate original 

 description. 



That the males of the immaculata and arizonica groups of this 

 section of Ochrosidia, should so resemble each other as to be invari- 

 ably confounded and mingled together indiscriminately in probably 

 every known collection, and yet have their females so radically 

 different in facies, is an unexplainable fact, which however is 

 doubtless the result of different life habits. Mr. Bates, in describing 

 coahuilce, had before him a species of the immaculata type, and in 

 comparing it with known forms, mistook the arizonica type, having 

 similar males and females, for the true immaculata, having the 

 sexes dissimilar. 



Section B. 



The general color scheme and structure of the antenna? in both 

 sexes in this section resemble completely the corresponding features 

 of the preceding section, thus precluding any suggestion of subge- 

 neric difference, although the slender form of the body, quadrate 

 and apically much reflexed clypeus, very different anterior tarsal 

 claws of the male, margination of the pronotal base and very short 

 tarsi in both sexes, would otherwise indicate such a subgeneric 

 status. The side margins of the prothorax and elytra bristle with 

 erect setae throughout. The species are moderately numerous but 

 have as yet, as in the case of Section A, never been studied and are 

 therefore almost wholly undescribed; they are, so far as known, 

 as follows: 



Elytra abruptly much wider than the prothorax. Body above the aver- 

 age in size, elongate, strongly convex, smooth and rather shining, 

 castaneous, the elytra slightly more yellow; head (cf ) convex, more 



