AMERICAN COLEOPTF.TIA. HI 



Group A. — Body very convex, elytra not truncate at apex ; head tuberculate ; 

 anterior femora not fimbriate; anterior tibiae above tlie upper tooth en- 

 tire, not serrate; anterior sjuir of middle tibiae slender, conspicuous ; 

 middle and hind tarsi with first joint at least as long as the three follow- 

 ing; apex of hind tibiae fringed with sliort equal spinules. 



This grotip corresponds with Teucheatks, Muls., and contuius but 



one species introduced iuto the Canadian fauna from Europe. 



A. fossor, Linn. {Scarabaeus) Fauna Suec. p. 134. 



Oblong, convex, black, shining; elytra finely punctate-striate"; front tritu- 

 berculate. 



Male. — Middle frontal tubercle prolonged into a short horn ; thorax slightly 

 impressed in front; anterior tibire with an elongate spur obtuse at ti]:). Length 

 % 3()— .48 inch ; 9—12 mm. 



Female. — Frontal tubercles small, equal; thorax not impressed; anterior 

 .tibiiB with a more slender, acute spur. 



This species is said to vary in having reddish elytra. 

 Specimens have been received from Canada and the Xew England 

 States. 



As this species is so well known abroad and may be readily recog- 

 nised by student of our fauna by its large size and peculiar characters, 

 I have contented myself with copying the short but characteristic de- 

 scription of Erichson. 



Group B. — Form elongate oval, sub-depressed : head not tuberculate ; anter- 

 ior femora (especially in % ) fimbriate with moderately long hairs; outer 

 edge of anterior tibiae usually serrate above the upper tooth ; anterior 

 spur of middle tibiae "J, short robust, not conspicuous, that of female longer, 

 more slender and acute ; middle and hind tarsi with the first joint 

 elongate, that of the hind tarsus of male deformed; apex of hind tibiae 

 frimbriate with unequal sjiinulcs. 



The deformity of the first hind tarsal joint of the male is a peculiar, 

 ity not known to me in any species outside of this group. The joint 

 may be described as V-shaped, attached to the tibia3 by the longer 

 and broader branch, the other being shorter, more slender and acute 

 at tip. The inner or anterior spur of the middle tibia is short, rather 

 robust and partially concealed, being scarcely longer than a fourth of 

 the outer spur. The spur of the anterior tibitc of male is very broadl}' 

 spatulate and varies somewhat in accordance with the species, that of 

 the female being much more slender and sub-acute at tip. In all the 

 species the front is broadly rounded, slightly emarginate at middle. 



This Section is probably equivalent to Colobopferiis, Muls., but I can 

 find no uiention of the peculiar sexual characters in an specific descrip- 

 tion. 



