NORTH AMKRICAN APTERA. 291 



marking, and scattered light colored spots. Eye eminence of n)oderate size, of 

 nearly equal lieight, length and breadth; blackish above; slightly canaliculate, 

 with a row of small, acute tubercles ou each carina. Mandibles yellowish brown, 

 with obscure markings of a darker color, especially on the inner dorso-lateral 

 surface of the second joint, where they are arranged in the form of a series of 

 irregular parallelograms; dorsal surface of second joint sparsely clothed with 

 stiff hairs; tips of claws black. Palpi long, very robust; dark reddish brown, 

 lighter distally ; femur enlarging from base to apex, with a very robust spur-like 

 process on its outer ventro-lateral surface, near the distal extremity, the anterior 

 edge of which is provided with a row of short black tubercles; dorsal surface 

 of femur with numerous scattered, short, black tubercles, and a few also on the 

 proximal portion of the inner ventro-lateral surface; sparsely provided with 

 spinose hairs; patella short, thick, so united with the femur as to form an arch ; 

 with sparse hairs and a few scattered tubercles on its dorsal and outer lateral 

 surfaces; tibia arched, densely clothed with long, black hairs; a patch of short, 

 black tubercles on the proximal portion of its ventral surface, and a short row 

 of similar tubercles on the apical portion of its inner ventro-lateral surface; 

 tarsus terminating with a short, denticulate claw. Ventrum light reddish brown ; 

 coxae reddish, with a few short hairs; two anterior pairs with a row of subobso- 

 lete tubercles on the cephalic border. Legs reddish brown, with darker annu- 

 lations; joints near body having rows of short spines. Shaft of genital organ 

 very robust, flattened, distally contracted and curved, and terminating in a short 

 acute point. 



No fully developed specimens of this species were present in tlT^ 

 collections at hand, and the above measurements and description are 

 taken from individuals from Illinois and North Carolina. I presume 

 adult Dakota forms will have much shorter legs than the above 

 measurements, and shall not be surprised if they prove sufficiently 

 distinct for a subspecific name. 



I have never been able to determine definitely the female of this 

 species. Until this sex is found we shall be unable to sav definitely 

 whether the species belongs to Liohunum or not. 



PHAI.AKGIUM Linne, 1758. 



Teguments soft; dorsum furnished with small, acute tubercles, 

 lateral pores large, elongate-oval ; first joint of mandibles with no 

 tooth on lower surface. Palpi simple, sometimes having the inner 

 distal angle of the patella very slightly i)roduced, but never pro- 

 longed into a process ; claw not pectinate ; maxillary lobe of second 

 pair of legs much longer than wide, gradually narrowing from the 

 base to apex, directed obliquely forward. Legs long, more or less 

 robust. Eye eminence of medium size, canaliculate, provided with 

 two series of pointed tubercles. 



TKANS. AM. ENT. SOC. XX. OCTOBEK, 1893. 



