AQUATIC INSECTS IN NEW YORK STATE 353 



rufipes Meigen. See li i r t i p e s . 

 sericea Linnaeus. See r e p t a n s . 



♦tamaulipense Townsend, N. Y. Eut. Soc. Jour. 1S9S. v. 7. Tex. 

 tarsale Williston. See p u 1 c h r u m Philllpi. 



tribulatum I.ugger, Miun. Agric. P]xp. Sta. Kep't 1896. pu205-7. Prob- 

 ablj' equals v i 1 1 a t u ni . (p.385. Seq.) 

 (P^igured but not described) 

 *venustum Say, Acad. Nat. Sci. Phil. Jour. 3:28; Compl. Wr. 2:51 



Wiedemann, Auss. zw. Ins. 1:71. Ohio, D. C (Osten Sacken, cata- 

 logue). N. J. (Johnson); Can., N. H., N. Y., Mich., Minn., Wyo., B. O.,. 

 Cal., Tex., La.., Miss., Fla., (Coquillett); Id. The following synonymy 

 is according to Coquillett. 18D8. 

 1862 molestum Harris, Ins. Inj. to Vegetation. (Not described) 

 1870 p i s c i c i d 1 u m Riley, Am. Ent. 2:367. Mumford N. Y. 

 ♦virgatum. Coquillett, U. S. Nat. Mus. Proc. 1902. 25:97. New Mexico. 

 *vittatura Zetterstedt, Ins. Lapponica. 1840. p.808. Staeger Groenl. 

 Antl. Greenland (Osten Sacken's catalogue); N. J. (Johnson); Alas. 

 (Coquillett 1900); Cal., Kan., Minn.; N. Y., Neb. (Coquillett 1898), Id., 

 S. Dak. The following synonymy according to Coquillett. 



1848 decorum Walker, List. Ins. p. 112. Hudson Bay Ter. 

 1893 a r g u s Williston, N. Am. Fauna, no. 7, p. 253. Cal. 



KEY TO SPECIES OP SIMULIUM 



La)'vae 



1 Mature larva 6 or 7mm long, with the dorsal surface of the 



head nearly white; the rays of the fan number about 30. 

 Larva from Santa Cruz mountains, Cal. [p.3S7]. 

 Head usually brown; rays of the fan usually 40 or more (2> 



2 The top of the head Avith six black blotches or spots. Larvae 



from New Mexico [p.386]. 

 Head without six dark spots (3> 



3 The caudal blood gills ai"e three simple papillae (4) 



The three main branches are again subdivided (6) 



4 The middle tooth of the labium is simple and pointed, labium 



Avith six pairs of setae on its ventral surface [pl.o5, fig.2].v i 1 1 a t u m 

 The middle tooth at least is trifid. (5> 



5 All marginal teeth of the labium except the outer pair are 



trifid h i r t i p e & 



The middle tooth only is trifid; ventral surface with three 



pairs of setae [pL33, fig.8] p e c u a r u m (= i n v e n u s t u m > 



6 Full grown larvae 10-12mm in length, black in color, its 



labium with an elongate middle tooth [pl.36, fig.3] p i c t i p e s 



Paler larvae less than 10mm in length (7) 



7 No setae on the last .ioint of the maxillary palpus, middle 



tooth of the lab'um longer than the two lateral ones, four 

 pairs of setae on its ventral surface. The pair of apical 

 setae of the mandible not differentiated from the hairs 

 Avhich overhang the apex m e r i d i o n a 1 e 



