TMOPODS (»K NORTH AMERICA, 



295 



by the relative leiiotli of the mopods, the outer hraiieh heino- only 

 half as long- as the iiiiiei- one, while in ExoHphrroma (h«jesi both 

 branches are of nearly eciiial length, and by the ditl'erence in color. 

 7y7>^^— Cat. No. IDfidH. T.S.N.M. 



EXOSPHiEROMA DUGESI (Dollfus). 



Sphtrroiiia diK/fsi Doi.i.fis, I'.nll. Soc. /ool. Fniiicr, Will, ISi):}, p. 115, figs. 1-2. 

 L(W((Vitij. Mexico (fresh water); Kaux therniales dWgiias-Calientes, 

 etat (FAguas Calientes; Mexico. 



FUi. :U;^.— EXOSI'II.EKOMA DltiKSI (AFTER DOLLFUS). a, HKAD AND FIRST TIlORAllC .SKGMKNT. 

 /), ABDOMKN and IIROPODA. 



Body ovate, twice as long as wide, mm.: 12 mm. 

 Head twice as wide as long, !^ mm.: 4 mm., with a frontal l)order 

 arising Ix'tween the eyes and produced in a small median point. 



Fk;. 314.— Exosi'H.EROMA DrciEsi. a, Mandiui.f. ■ \\. 6. Frontal lamina and clypf.us. x 23. 



c, Ma.villipf.i). : 11. 



E3'es small, round, composite, and situated in the post-lateral angles 

 of the head. The ])asal article of the tirst pair of antenna' is long; the 

 second is half as long as the tir.st; the third is one and a half times 

 longer than the second. The llagellum is comijosc^d of (Mght ailicles. 

 The first antcMina' extend to the middle of the tirst thoracic segment. 



