AQUATIC INSECTS IN NEW YORK STATE 453 



■aa Tracheal gills on ventral side of the first seven abdominal 

 segments; last pair of spiracles not raised on respiratory 

 tubes nor on conical folds 



6 Antenna* vfith five segments Neuromus 



66 Antennae with six segments Oorydalis 



Egg masses^ 



a Mass not covered Chauliodes 



«a Mass normally covered with a whitish coat of albuminous 



matter Oorydalis 



Eggs 

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



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

 •00 Micropylar projection near the apex; necli nearly as broad as 



micropylax surface [flg.20]" Oorydalis 



CHATinoDEs Latreille 



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

 male often being smaller than the female. Prothorax quadran- 



• strfA 



'"A 



Fig. 24 Fore wing of ChauUodes x3 



gnlar, 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 labrum when closed; 

 wings numerously veined, the accessory veins of the radial sector 

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

 with four to six branches, and medius always with only two 

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

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

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

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

 ages 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. 



