INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 539 



A K T I (' V JL A 'r A . 



INSECTA. 



The insects included in the following catalogue have mostly been de- 

 termined by A. S. Packard, jr., M. D., and by George H. Horn, M. D., 

 who have also kindly furnished descriptions of the new species. Our 

 thanks are also due to Dr. H. A. Hagen, who has identified some of the 

 species. The Pycnogonids have been determined by Mr. S. I. Smith. 



DIPTERA. 



Chironomus HALOPniLUS Packard, sp. uov. (p 415.) 



Full-grown larvoe were dredged in 10 fathoms in Vineyard Sound, 

 several miles from land, among compound Ascidians, (A. E. V.;) and 

 several young larvae were dredged in 8 to 10 fathoms in Wood's 

 Hole Passage, September 10, (A. S. P.) 



"This is a true Chironomus, the body being long and slender, with 

 the usual respiratory filaments at the end of the body. Head red as 

 usual, chitinous ; autenure slender, ending in two unequal spines; eyes 

 black, forming conspicuous dots ; mandibles acute, three-toothed. 



From lower side of autepenultimate segment arise two pairs of long 

 fleshy filaments, twice as long as the diameter of body, not containing 

 tracheae, so far as I can see; and from the end of penultimate segment a 

 dorsal minute tubercle, forming a cylindrical papilla, giving rise to eight 

 respiratory hairs about as long as the segment is thick; anal legs long 

 and slender, with a crown of about twelve spines. Two prothoracic 

 feet, as usual. In one larva the semi-pupa was forming ; length, 11""", 

 (.45 inch.) 



This species belongs in the same section of the genus with CMrono- 

 onus pliunosus, figured by Reaumer, (vol. iv, PI. 14, figs. 11 and 12; and 

 vol. V.)"— A. S. P. 



Chironomus oceanicus Packard, (p. 331.) 



Proceedings of the Esses Institute, vol. vi, p. 42, figs. 1-4, 1869. 

 Specimens apparently belonging to this species have been obtained 

 near ifew Haven, at low- water mark, among confervoe. It occurs at Sa- 

 lem, Massachusetts; Casco Bay; and the Bay of Fundy, from low-water 

 mark to 20 fathoms. 



CuLEX, species undetermined, (p. 4G6.) 



A species of mosquito is excessively abundant on the salt-marshes in 

 autumn, and the larvpe inhabit the brackish waters of the ditches and 

 pools. 



