297 



sy; legs extending much beyond apices of wings, the apices of fore 

 and mid tarsi ending at apex of fourth segment, those of hind pair 

 extending sHghtly beyond that point. Dorsum of all abdominal seg- 

 ments except first with stout short spines arranged in 2 transverse 

 bands, the anterior one consisting of 3-4 series of spines, the posterior 

 of one series; apical segment almost globose; spiracles distinct. 



Important Papers on North American Cecidomyiidae 



Eckel, L. S. 



'03. The resin-gnat Diplosis and three of its parasites. Ent. News, 

 14 : 279-284. 



Felt, E. P. 



'06- '16. Reports of the State Entomologist of New York. (These 

 reports include a vast amount of information upon this family, 

 and contain by far the best articles on it that have appeared here 

 or in Europe.) 



Osten Sacken, C. R. 



'62'. Monographs of North American Diptera. Part I, pp. 179-198. 

 '69. Biological notes on Diptera. Art. I. Trans. Am. Ent. Soc., 



2 : 299-303. 

 '71. Biological notes on Diptera. Art. II and III. Trans. Am. 



Ent. Soc, 3 : 51-54, 345-347. 



Williams, F. X. 



'09. The Monterey pine resin midge — Gecidomyia resinicoloides, 



n. sp. Ent. News, 20 : 1-8. 

 '10. The anatomy of the larva of Gecidomyia resinicoloides Wil- 

 liams. Ann. Ent. Soc. Amer., 3 : 45-57. 



Siiperfamily Bihionoidea 



I have restricted Coquillett's superfamily Bihionoidea to include 

 only Simuliidae, Bibionidae, and Scatopsidae. 



The imagines present closer affinities than do the larvae at a first 

 glance, but characters that link the larvae are not wanting. It is very 

 evident throughout all orders that a difference in larval habitat, and 

 especially the difference between an aquatic and a terrestrial one, re- 

 sults in a very marked difference in the structure of the larva. It is 

 possible that I have placed too much emphasis upon the structure of 

 the imagines and overestimated the effect of different habitats upon 

 larval structure in my grouping of the families placed here. I believe, 

 however, that these families are closely related, in fact more closely 

 related to each other than any one of them is to any other family in 



