THE CRANE-FLIES OF NEW YORK PART II 815 



to the writer that the present generic reference is more nearly correct, 

 altho the distinctions between Limnobia and some species of Libnotes 

 are very poorly marked. L. perkinsi was bred from larvae in damp moss 

 (Perkins, 1913 :clxxxii, as Limnobia), and in a letter to the writer Mr. O.H. 

 Swezey states that he has reared this species from larvae in decaying 

 vegetation and in the accumulation of debris behind old leaf -sheaths on 

 banana plants (Musa, Scitamineae) in the Hawaiian Islands. 



Genus Discobola Osten Sacken (Gr. discus + I throw) 



1865 Discobola 0. S. Proc. Ent. Soc. Phila., p. 226. 



1869 Trochobola O. S. Mon. Dipt. N. Amer., part 4, p. 98. 



Discobola is a well-marked genus including about eight described 

 species, which are most numerous in the Australasian region, two species 

 only being found in Europe and two others in America. The adults of 

 the commoner American species, D. argus (Say), are not rare. They are 

 most numerous in late summer, and are often found resting on the stumps 

 and trunks of coniferous trees, especially white pine (Pinus Strobus 

 Linn.). 



The immature stages of D. caesarea (O. S.) were found by Mik (1884) 

 in Austria, living in decaying pine stumps from which the bark had been 

 removed. The following account is taken entirely from Mik's paper: 



Male pupa. Body cylindrical, slender (9.2 mm. long, 1.5 mm. in diameter). Head, 

 prothorax, mesothorax, leg sheaths, and wing sheaths chitinized, dark brown, shiny, the 

 last-named somewhat brighter than the others, the leg sheaths somewhat darker at their 

 'tips. Eyes kidney-shaped, strongly shiny, blackish, between them a small, triangular, 

 blackish brown spot. Prothoracic breathing horns dull-colored, dark rust-brown at base, 

 becoming a brighter rust-brown more distally, compressed laterally, tuberculate, with margin 

 indented. Prothorax carinate, rust-yellow, margined on both sides by dull reddish brown 

 tubercles. In fully colored specimens, forehead and leg sheaths blackish brown, wing pat- 

 tern indicated on sheaths as somewhat diffused rings. Leg sheaths reaching end of abdominal 

 segment 3, wing sheaths reaching end of abdominal segment 1. Metathorax and abdomen 

 thin-skinned, the former verdigris-colored, the latter white or somewhat yellowish green; 

 metathorax resembling an abdominal segment, but its posterior margin is unarmed, while 

 the first to the fifth abdominal segments on both dorsum and venter bear a comb of very small, 

 short, blunt teeth, which are closely approximated; these teeth chitinized and rusty brown at 

 their tips, giving to abdomen the appearance of having brown incisions; these transverse 

 rows of teeth interrupted at pleura. Sixth abdominal segment pale thruout and lacking 

 the comb. Seventh segment shorter and narrowed on dorsum, pale, bearing on sternum 

 a rust-yellow chitinized plate which is narrowed anteriorly, leaving an uncolored triangular 

 area on either side at base of segment. Eighth segment swollen to include genitalia, the 



