NORTH AMERICAN COLEOPTERA. 171 



CoPRis PROCIDUA Say. — Dr. Horn has mentioned to me the occur- 

 rence from Texas to Costa Rica of what appears to him to be Copria 

 procidua Say, described from Mex., Bost. Jour. 1837, I, p. 176 ; ed. 

 Lee. II, p. 650. Two males are before me from Texas and Guatemala. 

 They resemble C. remotus but differ chiefly by having the horn on the 

 head more advanced in position and behind it an acute tubercle, which 

 in Say's type was more developed and inclined forward, and by having 

 the hind tarsi of the usual form and not shorter and broader. The 

 spurs of the front tibiae are obtuse and flattened, at tip slightly incurved 

 and concave beneath. 



HoPLlA TRIFASCIATA Say. — In examining a series of this well known 

 species it will be noticed that there is considerable variation in the num- 

 ber and form of the . scales. In the males the upper surface is hairy 

 either entirely without scales or with a few of the hairs replaced by 

 small scales, especially before and behind the middle of the elytra where 

 the scales are the most thinly placed in the female. In the females- 

 commonly found in Massachusetts the thorax is quite thickly clothed 

 with erect hair more or less intermixed with scales which are broader 

 than those of the elytra where they are usually arranged more densely 

 in a basal, median and posterior band. Beneath, the scales are narrowly 

 oval or rounded in form in difierent specimens, more thickly placed on 

 the abdomen, but not at all crowded. Anteriorly the under surface is 

 moderately clothed with hairs. 



In an extreme variety from an elevation of 2000 feet in the White 

 Mountain region of N. H. where the specimens occurred on the flowres 

 of Pyrus arhutifoUa ^ or chokeberry, the males have a larger proportion 

 of scales on the upper surface and the females have the head and elytra 

 more scaly and the thorax and entire under surface very densely clothed 

 with yellowish rounded scales which are very much imbricated, and the 

 pubescence is much less obvious. 



Another form of the female from Mass. presents a very fair instance 

 of dimorphism, the upper surface being simply hairy or with very feeble 

 development of scales thus simulating the male in appearance and it 

 would be naturally associated with specimens of that sex, without careful 

 observation, as slightly immature examples, the color being not quite so dark. 



In conclusion it may be observed that as mentioned by LeConte the 

 middle tibias of the female have a distinct spur, while in the male they 

 are unarmed. The male diifers further by the stouter tarsi and claws, 

 the anterior claws especially being much larger. 



