A. S. Packard, Jr., on Insects inhabiting Salt water. 105 



far as the puparia indicate, to the above species. The puparium 

 ofR Californica differs from that of ^. halophila, in being about 

 a third larger, and in having a large rounded tubercle on the 

 side of the 9th and 10th segments of the body ; while the 

 seventh pair of feet are as large as the sixth, being in K halo- 

 phila scarcely larger than the five basal pairs. The respiratory 

 tube is not half as long as the body in K halophila. The Mono 

 Lake specimens are -55 inch long, and the respiratory tube "21 



Fphydra gracilis, n. sp.— These insects occur so abundantly 

 where they are found, and can be so easily reared, that I ven- 

 ture to name another form from Great Salt Lake, specime: 



puparia of which have been communicated by Prof Yer- 



rill, from the collection of Mr. Sereno Watson ; and by S. A. 

 Brio-gs, Esq., of Chicago. It is much smaller and slenderer 

 than any of the preceding species, the smaller specimens being 

 •25 inch long, the largest '50 inch. The respiratory tube is 

 much longer than in any other species known to me, bemg m 

 several specimens as long as the body itself; the branches into 

 which it subdivides being over one-third as long as the base ot 

 the tube. The bodv is of the shape of R halophila, but is 

 much slenderer, while the feet are larger and more prominent. 



Three specimens of heteropterous Hemiptera, from Clear 

 Lake, were submitted to Mr. P. E. Uhler, who has kindly given 

 me the following description of them. 

 iSalda interstitialis Say. Jour. Acad. Philad., iv, p. 324. 



A single 9 specimen, from Clear Lake, California. If the 

 specimen was taken out of the water, it had occurred there by 

 accident These insects do not live in the water ; but afl'ect the 

 marshy ground sometimes adjacent to it The specimen is im- 

 mature, lacking the black color proper to the hemelytra and 

 wings; but having the clavus, except at its tip, the base of 

 the corium, and two or three streaks thereon black. The nerv- 

 ures of the membrane are simply brown. 

 Eygrotrechus robustus, n. sp. 



One female of this genus (belonging to the family Hydrome- 

 tridiB) very much mutilated, alone serves us for the present 

 notice. In form it resembles R remigis Say, but the abdomen 

 is more uniformly robust towards the tip. The head is dark 

 brown, fuscous on the middle, sericeous pubescent on the sides 

 and beneath, with a pale arc on the impression at the base ot 

 the vertex. Antennae robust, brownish-ochreous, the second 

 joint just one-half as long as the basal one, the remaining ones 

 destroved. Eostrum brown, extending a verj^ little way behind 

 the anterior cox^. Eyes pale brown, large. Thorax robust, 

 pale brownish-testaceous, beneath brownish-ochreous, sericeous ; 

 the anterior lobe of pronotum blackish, divided m the middle 



