AQUATIC INSECTS IN NEW YORK STATE 459 



with a broad white hand, pointed with fuscous, not attaining 

 the posterior margin; one or more apical marginal spots, some 

 cross veins bordered with white; posterior pair with a broad 

 arcuate white band not attaining the posterior margin, and a 

 large rounded basal white spot, also a small apical spot and 

 sometimes .the cross veins bordered with white. Length to tip 

 of wings 35 to 40 mm; alar expanse 60 to 70 mm. The males 

 are the more highly colored on the head and thorax, and the 

 dark part of their wings is more uniformly black. 



The inferior appendage of the male is elongated, narrower 

 at tip, and of a pale brown color. The males are the smaller. 



When the wings of this species are spread, the white arc 

 across their center is nearly continuous from one to the other. 



New York, Pennsylvania, Glen Echo D. C, Maryland, Sugar 

 Grove O., Illinois, Lake of the Woods, Missouri, Arkansas, 



Mexico. 



2 C. serricornis Say 

 1824 Cbauliodes serricornis Say, Long's Exp. 2:307 

 1839 Ohauliodes serricornis Burmeister, Handb. Ent. 2:949 

 1842 Neuromus maculatus Rambur, Hist. Nat. Neur. p.442, pl.lO, 



flg.2 

 1853 Hermes maculatus Walker, Cat. Brit. Mus. Neur. p.202 

 1859 Chauliodes serricornis Say, Am. Ent. LeConte ed. 1:206 

 1861 Chauliodes maculatus Hagen, Synopsis Neur. N. Am. p.l91 

 1863 Chauliodes serricornis Hagen, Ent. Soc. Phila. Proc. 2:180 

 1863 Chauliodes serricornis Walsh, Ent. Soc. Phila. Proc. 2:262 

 1869 Chauliodes serricornis McLachlan, Ann. and Mag. Nat. 



Hist. (4) 4:40 

 1892 Chauliodes serricornis Banks, Am. Ent. Soc. Trans. 19:357 

 1892 Chauliodes serricornis Say, Banks, Am. Ent. Soc. Trans. 



19:357 

 1901 Chauliodes serricornis Needham, N. Y. State Mus. Bui. 47, 



p.549, pl.27 



Body black; back of head with flat, ferruginous streaks and 

 spots which are sometimes black; prothorax fuscous, impressed 

 each side; legs and feet nigro-fuscous; antennae serrate in both 

 sexes; inferior appendage of male is of a shining black at tip; 

 wings black, a transverse interrupted white line in middle of 

 front wings, widest at anterior margin, not attaining the pos- 



