MEGARHINUS 927 



prothoracic subdorsal tuft, a larger lateral 2-haired tuft from a tubercle and a sub- 

 ventral tuft; mesothorax with a minute multiple subdorsal tuft in the disk, a large 

 lateral one from a small, thorn-shaped tubercle and a large subventral tuft; meta- 

 thorax with the subdorsal tuft many-haired and long but very fine, lateral tuft with 

 four feathered hairs and a simple one from a thorn-like tubercle. Abdomen sub- 

 moniliform, rather slender; a single long lateral hair on the first segment, two on 

 the second, from large tubercles, the subdorsal hairs fine and stellate; on segments 

 3 to 8, the hairs are fine, in substellate bunches, but long, as long or longer than the 

 diameter of the body, both subdorsal and lateral. Lateral comb of the 8th segment 

 an irregularly quadrangular plate, reaching near the dorsal line, the nine short 

 teeth set on its posterior edge on the lower two-thirds, thorn shaped, with fine 

 lateral feathering; a single hair and two tufts behind the plate, the upper with a 

 large tubercle. Air tube straight and not tapered, four times as long as wide, light 

 brown, with a narrow black basal ring; a single tuft slightly before the middle, 

 from a raised tubercle, just beyond the pecten, which has 16 teeth, broad, finely 

 feathered, pallid. Anal segment ringed by the plate, about as long as wide, the 

 chitinous ring excavated below to admit the short ventral brush; the brush has few 

 tufts and is surrounded by a narrow chitinous band which joins the ring on the 

 ventral line; a fringe of fine spines on the posterior edge of the plate. Dorsal tuft, 

 a group of long hairs on each side. Anal gills small, slender, about as long as the 

 segment, apparently four in number. 

 Type. Cat. No. 10010, U. S. N. M. 



Description of Larva of Uranot^nia anhydor (For Description of Female, Male, 

 AND Pupa see Appendix, Page 1041) : 



Larva, Stage IV. Head elongate, elliptical, bulging at eyes ; front promi- 

 nent, the clypeus large, with a median emargination and a short stout spine on 

 either side of it; antennae rather small, subcylindrical, slightly thickened 

 basally, scarcely spinous, with a single hair near base; dorsal head-hairs not 

 thickened, the upper pair a tuft of three fine hairs, the lower pair a single coarse 

 long hair; lesser lower tufts in fours, short; ante-antennal tufts multiple, well 

 developed. Lateral abdominal hairs long and coarse on first and second seg- 

 ments, fine, multiple and short on the succeeding ones ; subdorsal series in tufts. 

 Air-tube about five times as long as wide, scarcely tapered; pecten of fifteen 

 evenly spaced spines not reaching middle of tube, followed at middle by a large 

 multiple hair-tuft. Lateral plate of eighth segment with an angular projection 

 below and comb of nine sharp teeth on its posterior border, those near the 

 center longer than the others. Anal segment longer than wide, ringed by the 

 chitinous plate, which is spinose along its posterior margin; dorsal tufts of 

 three long hairs on each side; ventral brush long but sparse, confined to the 

 barred area ; anal gills four, equal, very slender, not as long as anal segment. 



A single larva was obtained in a swamp full of reeds, associated with 

 Anopheles occidentalis. Anopheles pseudopunctipennis, Culex tarsalis, and 

 Culex erythrothorax. 



Southern California. 



Sweetwater Junction, June 2, 1906 (Dyar and Caudell). 



Group MEGARHININES. 



Genus MEGARHINUS Robineau-Desvoidy. 



Megarhinus Robineau-Desvoidy, M6m. Soc. d'Hist. nat., iii, 403, 412, 1827. 

 MegarMnus Latreille in Cuvier, Regne Anim., 2 ed., v, 439, 1829. 

 Megarhinus Latreille, Les Crustac, Araclin. et Ins., ii, 439, 1829. 

 Culex Macquart, Hist. Nat. Ins., Dipt., i, 33, 1834. 

 Megarhina Macquart, Dipt. Exot., i, 1, 32, 1838. 

 Megarhina Walker, List Dipt. Brit. Mus., i, 1, 1848. 

 Megarhina Osten Sacken, Smiths. Misc. Colls., xvi, 1, 1858. 

 Megarrhina Osten Sacken, Smiths. Misc. Colls., xvi, 2 ed., 18, 1878. 

 Megarrhina Skuse, Proc. Linn. Soc. N. S. Wales, 2 Ser., iii, 1720, 1889. 

 Megarhina Lynch Arribaizaga, Rev. Mus. de la Plata, i, 372, 375, 1891. 

 Megarrhina Townsend, Trans. Am. Ent. Soc, xix, 149, 1892. 



