The Crane-Flies of New York — Part II 877 



of hairs surrounding two pairs of setiferous tubercles. The mental region 

 is not chitinized. The dorsal plates of the head capsule are widely sepa- 

 rated from each other by a median split. 



The pupae are often armed with spines or tubercles on or about the 

 head and the thorax. The lateral abdominal spiracles are large and 

 functional. 



The genera of the subtribc Hexatomaria may be separated by the 



following keys: 



Larvae 



1. Coloration of body a deep saturated orange-yellow; spiracular disk with ventral lobes 



unlined with darker, bearing at tips a few very long hairs. . . Penthoptera Schin. (p. 891) 



Coloration of body pale yellow, whitish, or greenish; spiracular disk with lobes lined 



with dark brown or black 2 



2. Size small, form slender (length 14-15 mm., diameter 1-1.3 mra.) . . Hexatoma Latr. (p. 877) 

 Size larger, form stouter (length over 15 mm., diameter over 1.6 mm.) 



Eriocera Macq. (p. 881) 

 Pupae 



1. Pronotal breathing horns short and stout, red at base and apex, the remaining part 



dark-colored, transversely wrinkled; horns bent strongly toward each other at tips. 



Penthoptera Schin. (p. 891) 

 Pronotal breathing horns not as above 2 



2. Size small (length under 10 mm.) Hexatoma Latr. (p. 877) 



Size larger (length over 12 mm.) Eriocera Macq. (p. 881) 



Genus Hexatoma Latreille (Gr. six + I cut) 



1809 Hexatoma Latr. Gen. Crust, et Ins., vol. 4, p. 260. 



1818 Nematocera Meig. Syst. Beschr. Zweifi. Ins., vol. 1, p. 209. 



1818 Anisomera Meig. Syst. Beschr. Zweifl. Ins., vol. 1, p. 210. 



Larva. — Size small (length of Hexatoma megacera about 14 mm.). Spiracular disk sur- 

 rounded by two pairs of lobes, ventral pair the longer, inner face marked with a narrow 

 brown line which is expanded at its inner end. Head capsule with lateral angles of labrum 

 elongate and densely clothed with hairs. 



Pupa. — Size small (length under 10 mm.). A large spinous tubercle on scape of antenna. 

 No median projection on mesonotal scutellum. Pronotal breathing horns short and straight. 

 Wing pads with cell Ri very small and M with but a single branch reaching wing margin. 



The genus Hexatoma includes a small number of forms with a chiefly 

 Holarctic distribution, there being about eleven Palearctic, two Ethiopian, 

 and one North American species so far described. The adult flies of 

 the North American species, Hexatoma megacera, are common on vegetation 

 along the banks of rather large streams. They are discussed herein in 

 detail under the account of this species. The adult flies of some of the 

 larger European species have habits quite like those of the genus Eriocera, 



