THE CRANE-FLIES OF NEW YORK PART II 909 



phomyia but are longer in other genera, and the middle tarsi are usually 

 shorter than the other legs. The abdominal segments are subdivided 

 into two rings, the posterior ring with a transverse row of spines and 

 setae before the margin. The lateral spiracles are small, protuberant, 

 and, in some cases at least, apparently functional. The dorsum of the 

 eighth abdominal segment is provided with four or five lobes, which are 

 in some cases (as in some Ormosia) spinous at the tips. 



The writer has subdivided the tribe Eriopterini into two divisions: 

 the Elephantomyaria, with Elephantomyia and presumably Toxorhina 

 and Ceratocheilus, and the Eriopteraria, including the other Nearctic 

 genera as known. It is probable that Cladura and its relatives will require 

 a division when their immature stages are better known. 



The genera of the tribe Eriopterini may be separated by the following 



keys: 



Larvae 



1. Spiracular disk surrounded by four lobes 2 



Spiracular disk not as aoove 3 



2. Ventral lobes with a single powerful seta; coloration a saturated golden yellow; lives 



under bark Elephantomyia O. S. (p. 952) 



Ventral lobes fringed with short setae; coloration pale yellow; lives in earth. 



Rhabdomastix Sk. (p. 942) 



3. Spiracular disk obliquely truncated, appearing indistinctly trilobed or without lobes. . .4 

 Spiracular disk squarely truncated, surrounded by five lobes 5 



4. Mandibles with eight teeth; mental plates with seven teeth; lives in earth. 



Chionea Dalman (p. 950) 

 Mandibles with less than eight teeth; mental plates not toothed; lives under bark. 



Teucholabis O. S. (p. 945) 



5. Spiracular disk ending in five flattened black plates which are finely toothed along their 



margins Genus incertus, Eriopterine No. 1 (p. 956) 



Spiracular disk not as above 6 



6. Ventral plates of head capsule expanded and toothed at anterior ends 7 



Ventral plates not toothed as above . .- 



7. Ventral plates with four teeth; coloration yellow; spiracular disk large, very heavily 



marked with black Molophilus Curt. (p. 911) 



Ventral plates with five to eight teeth; coloration green; spiracular disk very reduced, 

 almost unmarked Erioptera (chlorophylla 0. S.) (p. 918) 



8. Marks of all the lobes solidly black Trimicra O. S. (p. 932) 



Some Ormosia Rond. (p. 922) 

 Some of the marks more or less split by a pale line -9 



9. The three dorsal lobes solidly dark, the ventral pair split by a pale line 10 



All paired lobes split by a pale line J1 



10. Coloration saturated yellow; anal gills bluntly rounded; lives under bark. 



Gnophomyia O. S. (p. 934) 



Coloration pale yellow; anal gills elongate; lives in earth. 



Helobia St. Farg. et Serv. (p. 928) 



11. Lobes surrounding disk very stout, blunt; marks of lateral lobes surrounding s P ir a cle ? 



and often suffusing disk Gonomyia Meig., subgenus Leiponeura Skuse (p. VM) 



Lobes surrounding disk longer; marks of lobes not so extensive ** 



