AQUATIC INi&BCTS IX NEW YORK STATE 35.5 



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

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



*tamaulipense Townsend, N. Y. Ent. Soc. Jour. 189S. v. 7. Tex. 

 tarsale Williston. See pulchrum Phillipi. 



tribulatum Lugger, Minn. Agric. Exp. Sta. Rep't 1896. pu205-7. Prob- 

 ably equals V i 1 1 a t u m . (p.o85. Seq.) 

 (Figured but not desci'ibed) 

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



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

 logue). N. J. (Johnson); Can., N. H., N. Y., Mich., Minn., Wyo., B. 0.,. 

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

 is according to Coquillett. 1898. 

 1862 m o 1 e s t u m Harris, Ins. Inj. to Vegetation. (Not described) 

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

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

 *vittatum Zetterstedt, Ins. Ijapponica. 1840. p.808. Staeger Groenl. 

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

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

 S. Dak. The following synonymj' according to Coquillett. 



1848 decorum Walker, List. Ins. p.ll2. Hudson Bay Ter. 

 1898 a r g u s Williston, N. Am. Fauna, no. 7, p. 253. Cal. 



KEY TO SPECIES OF S1MUL.IUM 



Larvae 



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



head nearly white; the i-ays 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 with six black blotches or spots. Larvae 



from New Mexico [p.386]. 

 Head without six dark spots (3) 



3 The caudal blood gills are three simple papillae (4> 



The three main branches are again subdivided (6> 



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



with six pairs of setae on its ventral surface [pl.35, 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 s 



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 u 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 joint of the maxillary palpus, middle 



tooth of the labium 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 

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



