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 respiratoi-y 

 tubes nor on conical folds 



6 Antennae with five segments N e u r o m u s 



hb Antennae with six segments Gorydalis 



Effg masses'L 



a Mass not covered Ghauliodes 



aa Mass normally covered with a whitish coat of albuminous 



matter Gorydalis 



Eiios 

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



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

 aa Micropylar projection near the apex; necli nearly as broad as 



micropylai- surface [fig.20] Gorydalis 



GHAULIODES Lati'eille 



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

 male often being smaller than the female. Prothorax quadran- 



Fig. 24 Fore wiug of Ghauliodes 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 b}^ the labrum when closed; 

 wings numerously veined, the accessory veins of the radial sector 

 extend backward from R. in both pairs of wings; radial sector 

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

 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. 



