AQUATIC INSECTS IN NEW YORK STATE 453 



</o Tracheal gills on ventral side of the first seven abdominal 

 segments; last pair of spiracles not raised on respiratory 

 tubes nor on conical folds 



b Antennae with five segments Neuromus 



66 Antennae with six segments Oorydalis 



' Egg masses^ 



a Mass not covered Chauliodes 



.«« Mass normally covered with a whitish coat of albuminous 



matter C o r y d a 1 i s 



Eggs 

 a Micropylar projection distinctly at one side of apex; neck less 



than half the width of micropylar surface [fig.20] ...Chauliodes 

 <ia Micropylar projection near the apex; neck nearly as broad as 



micropj^lar surface [fig.20] Corydalis 



CHAULIODES Latreillc 



Adult. Smaller than Oorydalis; body 20 to 40 mm long, the 

 male often being smaller than the female. Prothorax quadran- 



Fig. 24 Fore wing of Chauliodes x3 



gular, narrower than the head, and shorter than the mesothorax 

 andmetathorax combined; no toothed angle on sides of the head; 

 three large approximate ocelli facing at about 120° from each 

 other; antennae moniliform serrate, pectinate, or flabellate; 

 mandibles not prominent, concealed by the labnim when closed; 

 wings numerously veined, the accessory veins of the radial sector 

 extend backward from Ro in both pairs of wings; radial sector 

 with four to six branches, and medius alwaj's with onl}' two 

 branches [fig. 24] ; cross veins between all the branches of radius 

 varying in different species, from seven to about 20; hind wings 

 broad at base and folded in the anal area when at rest; alar ex- 

 panse 50 to 90 mm; tarsi cylindric, five jointed; caudal append- 

 iiges conical, stout, inferior pair often simple in both sexes, supe- 

 rior pair simple in female and slightly prehensile in male. 



lEggs of Neuromus have never been described. 



