84 The Graspedosomalidse of North America. 



howeA^er, seldom abundant, and we have spent considerable time 

 in collecting about 200. None of these are males, so that the 

 generic position of the species must remain somewhat in doubt. 

 We were very unwilling to believe that so large a number 

 of specimens were all females, and re-examined them several 

 times ; finally, in order to make sure that the internal structure 

 corresponded with the external appearance, longitudinal sections 

 of about 30 were cut, all of which showed more or less developed 

 eggs. We had begun to suspect parthenogenesis or some other 

 reproductive arrangement novel in Diplopoda when the specimens 

 of U. polygama were collected. Males were in that case found, 

 but with a disproportion of sexes so great as to encourage the 

 hope that the males of inloides will be discovei'ed by persistent 

 collecting. 



Some specimens of this species have the fifth joint of the 

 antennae equal to the third, a character otherwise found only in 

 Trichopetalum. The length, however, is not entirely the same in 

 specimens from the different localities. 



CASEYA gen. iiov. 



Eyes well developed, of niimerous (23) ocelli, arranged in subtriangular 

 patches. 



Antennae moderately robnst, clavate, third joing longest. 



Mandibles with eleven pectinate lamellfe. 



Promentum present, triangnlar. 



Segments cylindrical, without lateral carinte, longitudinally striate; setiger- 

 ous tubercles minute. 



Legs slender; terminal joint of male legs not hispid. 



First legs of male small and slender. 



Second legs of male very slender, the coxje produced into a curved process; 

 third joint tuberculate on the ventral face; claw normal. 



Third legs of male not crassate; coxise produced, third joint not swollen. 



Legs 4 and 5 not specially modified. 



Sixth legs with coxa somewhat enlarged, and with a tuft of hairs. 



Seventh legs of male with the coxa much enlarged, the other joints reduced. 



Genitalia of male of two pairs of laminae, the anterior large, the posterior 

 smaller, both pairs complex. 



Ninth legs of male two-jointed, the basal joint broad at base, produced 

 distad, second joint broadly oval. 



Tenth legs of male with coxae much enlarged, the other joints reduced. 



Segments of adult 30. 



Distribution : California. 



