PHYLLOPODS OF NOETH AMEEICA. 



301 



as in L. gouldii; the filiform lower end (PL I, Fig'. 4, hr.) is mucli sliorter 

 than in L. gouldii^ and endites 4-6 are also much shorter; while the 

 coxal lobe is large and very long. 



End of the body blunt, squarely docked, the point blunter than in L. 

 gouldii,, and ending in a slender spine. Two dorsal terminal filaments, 

 much as in L. gouldii. 



Length of carapace, or shell, 4™"^; breadth, 3"™. Forty-four females, 

 nearly all with eggs, occurred with Lepidurus couesii, in pools on the 

 west bank of Frenchman's Eiver, Montana, 49° IST. (Dr. Cones.) It also 

 occurred in large numbers associated with Limnetis hrevifrons in pools at 

 Ellis, Kans., collected by Dr. L. Watson June 29, 1874. The specimens 

 were females with eggs, and as a rule were triangular in outline, com- 

 pressed, only one or two of the Montana examples being so much com- 

 I)ressed. The species is easily recognized by the mucronate, tridentate 

 front, the short, thick hand and claw, by the number of antenna! joints, 

 and the long, narrow flabellum, the short endites 4-6, and by the long, 

 stout, jaw-like coxal lobes. 



Limnetis brevifeons Packard. 



Plate XXVII, figs. 1-3. 



Limnetis hrevifrons Packaid. Bulletin of Hayden's U. S. Geol. and Geogr. Surv., iii, 

 No. i, 172, April 9, 1877. 



Many females. Carapace decidedly triangular in outline, more so 

 than in L. gouldiij while it differs very decidedly in this respect from 

 gracilicoi^7iis, and is considerably larger than gracili- 

 cornis or mucroiatus, and is flatter than both. Front 

 shorter and broader than usual ; less contracted in 

 width at the base of the antennae than usual. The 

 frontal carina is high, especially a little in front of the 



Fig. 3. — 'Front of Fig. 4. — Limnetis hrevifrons. female, much enlarged. Bnrgess del. 



head of Lymnetis 



spp.-a, i. mwcro- cycs. Compared with that of Lymnetis gracilicornis 



Micornis ;'^'cf^L. i^^S' 3, ft, iu tcxt) it is much broader, shorter, the 



hrevifrons, d, d keel reaching to the end, which is squarely docked, 



.gou XI. ^^ ^^^ being a flattened triangle; the end of the 



front reaches to the middle of the antennae, while in i. gracilicornis the 



end reaches two-thirds of their length. It differs from L. gouldii (Fig. 



