AQUATIC INSECTS IN NEW YORK STATE 377 



black; in front, opaque with a silvery shimmer, and with sparse, 

 short, curly, golden yellow tomentum; behind, shining. Pleura 

 black, whitish pruinose. Abdomen black, the basal segments 

 opaque, the distal four segments somewhat shining, and with a 

 delicate whitish pruinosity. Legs reddish yellow; tarsi black, 

 except that the proximal half of the middle and hind metatarsi 

 is light yellow; first and third joints of the front pair each with 

 two long hairs; second and third joints of the same pair dilated, 

 the fourth and fifth very sn^ll; hind metatarsi elongate and 

 stout, the following two joints a little dilated, the fourth and 

 fifth small. Wings hyaline; veins yellow. Williston 



Three specimens. The above synonymy is according to Hun- 

 ter. 



This species seems to resemble greatly S. venustum ex- 

 cepting for the color of its legs. 



S. quadrivittatum Loew 

 Bei-l. Ent. Zeltsclir. 1862. Centur. 2, p. 186 



Black opaque, the thorax with four white vittae; the halteres 

 yellow; middle and hind tibiae and tarsi white banded; wings 

 hyaline. Body 1.67mm; wing 1.67mm. 



Black, opaque. Antennae fuscous; dorsum of the thorax with 

 four longitudinal lines, the posterior margin whitish pollinose; 

 scutellum spotless; the pleural spots and the metanotum 

 whitish pollinose; the legs fuscous black; the knees and the 

 bases of the metatarsi of the fore legs, the basal rings of the 

 middle and hind tibiae, the metatarsi excepting the tip, and the 

 bases of the second and third tarsal joints are white; halteres 

 yellow; wings hyaline, the heavier veins deep yellow. Otiba. 



S. reptans Linnaeus 



Fauna Suec. 1803. 1761 (Syuonymy according to Schiuer, 2) 



1767 s e r i c e a Linnaeus, Syst. Nat. 12:978. no. 58 



1776 erythrocephala DeGeer, Ins. 6:161, no. 37 (Tipula) 



1781 reptans L. Schranlv, Enum. Ins. Austr. p.985 (Culex) 



1804 argyropeza Meigen, Syst. Beschr. 1:291-92 



1818 reptans Meigen, Syst. Beschr. 1:291-92 



1818 s e r i c e a Meigen, Syst. Besclir. 1:296-98 



1818 e 1 e g a n s Meigen, Syst. Bescbr. 1:296-99 



1818 variegata Meigen, Syst. Beschr. 1:292-98 



1823 reptans Fries, Obs. Entoniol. Pars 1 Monogr. Simul. 1:13 



1830 c i n c t a Meigen, Syst. Beschr. 6:311-14 



1838 posticata Meigen, Syst. Beschr. 7:52, 21 



Male. Velvet-black; dorsum of the thorax with a silvery white 

 margin, spotlike on the humerus, broadly interrupted in front; 



