AMERICAN COMPONENTS OF THE TENTYRIIN^ 479 



the base, very feebly converging and straight posteriorly to the 

 rectangular, somewhat blunt and scarcely prominent basal angles, 

 the base broadly lobed in circular arc, sinuate laterally as usual ; 

 surface with the sinuous ridges strong, terminating at almost 

 equal distances from base and apex, the median line also feebly 

 and broadly tumid, except just before the middle, broadly flat 

 along the sides from near the apex almost to the base, the shining 

 tubercles peculiar, large, closely crowded along the ridges and 

 scattered medially toward apex and broadly toward base and 

 sides, wanting on the inner and outer slopes of the ridges and in 

 the median depressed space before the middle, very low and flat 

 throughout ; elytra not at all wider than the prothorax and only 

 three-fifths longer, broadly depressed suturally, the basal ridge at 

 the middle short, the ridge at outer third from near the base to 

 behind the middle of each strong, the short ridge at the middle 

 externally very feeble, the three subapical tuberosities small but 

 very strong and abrupt, the surface very coarsely, closely, con- 

 fusedly and unevenly pitted throughout and with unusually large, 

 very flat, irregular tubercles, larger and closer on the elevations ; 

 under surface with smaller flattened tubercles, the prosternum con- 

 cave throughout along the middle. Length 13.15 mm. ; width 5-28 

 mm. ((^). Mexico (Las Vigas), — Hoge * senex n. sp. 



These species are all allied to incsqualis Say, and vicina SoL, 



but morbillosa Sol., differs in its broader form and in having 



the basal ridge of the elytra anteriorly protuberant upon the 



pronotum ; chajufioni is described from two males and one 



female ; senex and subglabra each from two males and brevi- 



collis from a single male example, frominens from the female. 



The male seems to be much more common than the female and 



there is very little sexual difference in the general form of the 



body, the female being very slightly the stouter and perhaps 



usually with the vestiture somewhat denser. Longipenms is 



described from the female, and when compared with the female 



of exsculfta^ with which it is closely allied, is seen to differ in 



its much larger size, in the finer, sparser and more hair-like 



vestiture of the head and pronotum, shorter medial ridge of the 



elytra and differently arranged prominences near the apex ; the 



scales on the head of exsctilpta are broad and denser and the 



peripher}^ of the elytra posteriorly more coarsely and strongly 



crenulate. 



Noserodes n. gen. 



This genus is allied rather closely to Nosoderma^ but has the 

 small mentum rather more truncate at apex, the ligula shorter 



