inhabiting Salt Water. 235 



between the eyes. The mouth-parts form a broad, flattened, 

 thick mass, pressed to the breast and reaching the anterior 

 coxaj. Legs folded along the abdomen, the tarsi of the first 

 pair reaching to the distal end of the posterior coxaj ; the 

 wings reach halfway between the tarsi of the first and second 

 pairs of legs ; the third pair do not quite reach to the end of 

 the abdomen. At a later stage, when the integument is more 

 chitinous, long hairs clothe the body, the mouth-parts can be 

 distinguished, and the legs are longer, the anterior tarsi reach- 

 ing to the end of the Avings, and the third pair of tarsi nearly 

 to the end of the abdomen. All the appendages are enclosed 

 in the pupal membrane of the earlier stage. The tarsal claws 

 are now large and of mature form, while the wing-veins can 

 be readily traced. Length '25 inch. 



Prof. A. E. Verrill has kindly loaned me specimens of the 

 Epliydra from Mono Lake, Cal., " a body of water not only 

 excessively salt, but also strongly alkaline." These belong, 

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

 puparium oi E. californica differs from that oi E. Jialopliila in 

 being about a third larger, and in having a large rounded tu- 

 bercle on the side of the ninth and tenth segments of the body, 

 while the seventh pair of feet are as large as the sixth, being 

 in E. hcdojilula scarcely larger than the five basal pairs. The 

 respiratory tube is not half as long as the body in E. lialopliila. 

 The Mono-Lake specimens are 'bb inch long, and the respira- 

 tory tube '21 inch. 



Epliydra 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, specimens 

 of the puparia of which have been communicated by Prof. 

 Verrill, from the collection of Mr. Sereno Watson, and by 

 S. A. Briggs, Esq., of Chicago. It is much smaller and 

 slenderer than any of the preceding species, the smaller speci- 

 mens being '25 inch long, the largest '50 inch. The respira- 

 tory tube is much longer than in any other species known to 

 me, being in several specimens as long as the body itself, the 

 branches into which it subdivides being over one-third as long- 

 as the base of the tube. The body is of the shape of E. liaLo- 

 pliila, but is much slenderer, wdiile the feet are larger and 

 more prominent. 



Three specimens of heteropterous Hemiptera, from Clear 

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

 given me the following description of them. 



Salda intersfitialis, Say, Journ. Acad. Philad. iv. p. 324. 

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



