PHYLLOPOD VRUSTAGEANS. 



303 



carapace, the mandibular segment being small and not over- 

 lapping the segments behind it. The second antennae are 



Fig. 24B.~Lepidurus Couesii, 

 fide and dorsal view, natural 

 size. 



Fig. 247. — Apitg cequulis, natural size. 



large and in the male adapted for 

 clasping. In Thamnocephalus (Fig. 

 250, T. Irachyurus Packard, from 

 Kansas) there is a singular shrub- 

 like projection of the front of the 

 head, and the abdomen is spatulate 

 or spoon-shaped at the end. Bran- 

 cliinedes Coloradensis Pack. (Fig. 

 251) is a Eocky Mountain form. 



The brine - shrimp, Arteniia, \iyes Naupiiusof ^rfemiasafirtaofEu- 

 only in brine-vats or in the salt 



lakes of the West and of Southern Europe. Artemia gra- 

 cilis Verrill (Fig. 252) has thus far only been found in tubs 



-a, Larva ( 

 cH/ormis. — After Zaddach. 



