136 



for the identification of subfamilies, genera, and species, has been pre- 

 pared and will be published at an early date. The following table to 

 genera is given simply for the identification of specimens and does not 

 indicate natural relationships. The genera may be separated as fol- 

 lows : 



a. Spiracular furrows present on all the movable segments, that is, on 

 abdominal segments 5—7. 



b. Maxillae with a free portion or so-called ''raised tongue-case" 

 present — the maxillary loop, 

 c. Maxillary loop with its distal half recurved and touching the 

 proximal portion, forming a prominent loop on the ventral sur- 

 face of the body . Herse Oken. 



cc. Maxillary loop never with the distal half recurved, the distal end 

 touching the ventral surface of the body, 

 d. Maxillary loop strongly arched from the ventral surface of the 

 body, the greatest width of the space between the free por- 

 tion of the maxilla and the ventral surface of the body always 

 greater than the width of the maxillary loop in that region, 

 e. Dorsum of body with a strongly rugose triangular area on 

 each side of the meson of the metathorax and a similar 

 rugose band on abdominal segments 2-8 extending over the 

 cephalic third of the segment; lateral margins of the max- 

 illary loop with a serrate appearance; the distal end'of the 

 loop swollen and bulb-like and at least twice the width of 



the remaining portion Cocytius Hubner. 



ee. Dorsum of body with a strongly elevated transverse ridge 

 on each side of the meson on the metathorax, the ab- 

 dominal segments punctate, but never rugose on the ce- 

 phalic third; lateral margins of the maxillary loop never 

 serrate in appearance ; the distal end of the loop some- 

 what swollen but never twice the width of the remaining 



portion Plilegethontius Hubner. 



dd. Maxillary loop never strongly arched, but usually closely 

 applied to the ventral surface of the body, the space be- 

 tween the loop and the ventral surface of the body never so 

 great as the width of the loop in that region, 

 e. Cephalic margin of abdominal segments 5-7 with one deep 

 pocket-like furrow over each spiracle, 

 f. Maxillary loop extending as far caudad as the distal ends 

 of the prothoracic legs and occasionally beyond them. 



Atreus Grote. 

 ff. Maxillary loop never extending as far caudad as the dis- 

 tal ends of the prothoracic legs Dolba "Walker. 



ee. Cephalic margin of abdominal segments 5-7 with two fur- 

 rows, the ectal furrow shallow, the ental one deep and 

 pocket-like. 



