Jayne.] "^♦50 [Juno 10, 



Male. xViitcnnoc of nine joints, first very large, siib-oval ; second some- 

 what smaller ; 3-6 small ; 7-9 forming the club equal to all the preceding 

 united, of which the first is very small ; the second wider and longer ; 

 the last twice as wide as the second and almost three times as long as the 

 two united, obtusely pointed at tip. 



Female. Club of antenna; a little more than half as long as the preceding 

 joints taken together ; last joint as wide as, and little longer than the 

 second ; nearly truncate at tip. 



Occurs in the Atlantic district. 



PERIMEGATOMA Horn. 



Form elongated, only moderately convex, body dark in color. Head 

 moderately wide, front flat, epistoma moderately short ; a distinct ocellus. 

 Antenna? 11-jointed, club3-jointed, e^ceY>iin Belfragi, whereitisS-jointed. 

 Eyes large, round, prominent, and entire. Thorax twice as wide at base 

 as at apex, and half as long as the greatest width, very convex and promi- 

 nent in front, with a transverse depression across the base, Avhich is 

 slightly bisinuate. Sides arcuate, hind angles prominent, except in Bel- 

 fm(ji, where they are somewhat retracted. Scutellum small, but distinct. 

 Elytra long, sides nearly parallel, apices not separately rounded. Pro- 

 sternum only moderately broad, and very long, lobed in front, covering all 

 the mouth parts, except the labrum, produced behind into a short tip re- 

 ceived into the mesosternum, which is narrow and deeply emarginate. 

 No antennal fossa;, spaces between prosternum and lateral margins slightly 

 concave (Fig. 35), metasternum short, side pieces wide. Legs stout. 

 Posterior coxai do not attain the sides; coxal plate short, moderately i 

 wide (Fig. 34) ; first joint of tarsus long, 2-3-4 successively shorter, 5 as 

 long as first. 



This genus was established for several species, occuring from Lake 

 Superior to Texas, California and Sitka, which agree with Megatotna in all 

 the characters except in the antennal fossa?, which are absent in this genus. 

 The ornamentation, by the pubescence of the surface, resembles somewhat 

 that o? Megatotna, there being two transverse, undulating, cinereous bands, 

 the one at the basal third, the other at the apical fourth. 



The following is the arrangement of the species, proposed by Dr. Horn 

 (Trans. Am. Ent. Soc. 1875, p. 135) : 



Antennal club 3-jointed. 



First joint of club in both sexes, very little smaller than the 

 second joint. 



Pubescence unicolored, grayish-white (.10 inch) cylindricum. 



. Pubescence bicolored (.20 inch) variegatum. 



First joint of club extremely short. 



Pubescence bicolored (.14) falsnm. 



Antennal club 5 -jointed. 



Pubescence bicolored Belfragi. 



