DEINOCERITES 199 



a very large triangular patch. Air-tube about five times as long as wide, the 

 pecten of five coarse, sparsely-set teeth, reaching nearly half the length of the 

 tube ; a double-haired tuft beyond it, a small single hair near tip and another 

 on dorsal aspect. Anal segment longer than wide, with an illy defined dorsal 

 plate, which is spiny on its posterior portion; a small ventral plate between 

 brush and base. Dorsal tuft of a long hair and a multiple tuft on each side; 

 lateral hair small, single ; ventral brush arising from a prominent barred area. 

 Anal gills two, equal, elliptical, over half as long as anal segment. 



The larvge live in crab-holes in a similar manner to those of Deinocerites. 

 The specimens taken by Mr. Knab at Port Limon were in crab-holes on a side 

 hill beyond the reach of tide-water, the contained water being fresh, furnished 

 by a small rivulet. The water-surface was at a depth of several feet below the 

 orifices of the holes. The adults were found resting in the upper parts of the holes 

 in company with numerous specimens of Culex latisquama and Culex ex- 

 tricator. Mr. Busck collected this species from a series of crab-holes near Colon, 

 some of which at least contained brackish water. He obtained also Deinocerites 

 melanophylum and Culex extricator from these holes, but the catches from the 

 different holes were not differentiated, and it is possible that those containing 

 the Dinomimetes epitedeus and Culex extricator may have contained fresher 

 water. Mr. Jennings obtained a series of specimens on Caldera Island from 

 crab-holes which contained also some Culex extricator and no Deinocerites. 



East coast of Costa Eica to Panama. 



Port Limon, Costa Eica, adults and larvae in crab-holes, September 30, 1905 

 (F. KJnab) ; Colon, Panama, adults and larvae in crab-holes near the coast, July 

 20, 1907 (A. Busck) ; Caldera Island, Porto Bello Bay, Panama, adults and 

 larvae in crab-holes, January 19, 20, 1908 (A. H. Jennings). Two specimens 

 taken by Mr. Jennings at the same place January 4 and 19 are apparently with- 

 out setae on the postnotum. 



The hairs on the postnotum are not a group of independent hairs, as in the 

 Sabethini. Usually there are two hairs, springing from a common base; some- 

 times there is only a single hair. These hairs are coarser than those similarly 

 situated in the Sabethini. 



Genus DEINOCERITES Theobald. 



Deinocerites Theobald, Journ. Trop. Med., iv, 235, 1901 (without species). 



Brachiosoma Theobald, Journ. Trop. Med., iv, 235, 1901 (without species). 



Deinocerites Theobald, Mon. Culic, ii, 215, 1901. 



Brachiomyia Theobald, Mon. Culic, ii, 343, 1901. 



Deinokerides Giles, Gnats or Mosq., 2 ed., 335, 472, 1902. 



Brachiomyia Giles, Gnats or Mosq., 2 ed., 335, 473, 1902. 



Deinocerites Theobald, Mon. Culic, iii, 275, 1903. 



Deinocerites Sergent & Sergent, Guide Prat. etud. moust, 69, 1903. 



Deinocerites Lahille, Class, des Moust., 14, chart, 1904. 



Dinocerites Blanchard, Les Moustiques, 413, 1905. 



Brachiosoma (as synonym of Dinocerites) Blanchard, Les Moustiques, 414, 1905. 



Deinocerites Dyar, Proc Ent. Soc Wash., vii, 45, 49, 1905. 



Deinocerites Theobald, Mosq. or Culic. Jamaica, 8, 1905. 



Deinocerites Theobald, Gen. Ins., Dipt., fasc. 26, 37, 1905. 



Deinocerites Felt, N. Y. State Mus., Bull. 97, 491, 1905. 



Beinoceritinae Mitchell, Psyche, xiii, 19, 1906. 



Deinocerites Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 178, 188, 1906. 



Beinoceritinae Coquillett, U. S. Dept. Agr., Bur. Ent, Tech. Ser. 11, 11, 26, 1906. 



Deinocerites Knab, Psyche, xiii, 95, 1906. 



Deinoceritinae Mitchell, Psyche, xiv, 11, 1907. 



Deinocerites Knab, Journ. N. Y. Ent. Soc, xv, 121, 1907, 



Deinocerites Dyar & Knab, Can. Ent., xxxix, 48, 1907. 



Beinoceratinae Theobald, Mon. Culic, iv, 18, 1907. 



Deinocerites Williston, Man. No. Am. Bipt., 3 ed., 107, 1908. 



Deinocerites Pazos, San. y Ben., ii, 41, 43, 1909. 



Beinoceratinae Theobald, Mon. Culic, v, 553, 1910. 



