320 Annals Entomological Society of America [Vol. XI, 



The larvae of all those species observed, under the genus 

 Sciara as above restricted, i. e., those species possessing setose 

 media and cubitus, have the habit of migrating in a chain-like 

 line. None of the observed larvae of the Neosciara species 

 exhibit this feature. 



Neosciara new genus. 



This genus includes species which would formerly have 

 been placed under the genus Sciara, but which are now placed 

 under the above genus because they lack set^ on the cubitus 

 and media. 



Face short; palpi 4-jointed, the first very short and 'not 

 always differentiated from the second; antennae 2 plus 14 

 jointed; 3 ocelli, the laterals remote from the eye margin. 

 Thorax moderately arched. Legs slender, tarsal claws not 

 toothed. Wings microscopically setulose, not hairy; cubitus 

 and media with no setae. 



Type: Sciara coprophila Lintner. 



TABLE OF NORTH AMERICAN SPECIES OF THE REVISED GENUS ScidTa 



AND OF Neosciara. 

 a. Genus Sciara. Costa, radius, media except sometimes the petiole, and 

 cubitus of the wings distinctly though sparsely setose. 

 *b. Large southern species, 6 mm. or more in length; males undescribed, 



cingulata Riibsaamen 

 bb. Medium or small species. 



c. Ri ends noticeably proximad of the fork of M. 

 *d. Petiole of cubitus one-eighth as long as the basal section of M. (Fig. 219); 



clasper (Fig. 100); N. Y vicina Joh. 



dd. Petiole of cubitus scant half or more than half as "long as the basal 

 section of M. 

 e. Clasper with at least one stout apical spine, 

 f. Clasper with a single stout spine; costa produced two-thirds the 

 distance from the tip of Kg to Mi (Fig. 220); clasper (Fig. 101); 



Cal dives Joh. 



ff. Clasper (Fig. 1) with several stout apical spines and one more prom- 

 inent subapical spine; costa produced less than two- thirds the 

 distance from the tip of Rj, to Mi, (Fig. 32). ... 1. forceps n. sp. 

 ee. Clasper with no stout apical spines. 



f . The perpendicular distance from the crest of the arc of Mi to that of 

 Rs greater than the perpendicular distance from the tip of Rs. to 

 Ml (Fig. 33). Petiole of cubitus longer than the base of M. 

 Clasper (Fig. 2) 2. miiltisetifera n. sp. 



* This table is based largely on male characters, only a few well defined species 

 represented by females alone are included; cingulata is placed under both genera 

 since it is not certain whether the cubitus and media have setag or not. By wing 

 length is meant the distance from the humeral cross vein to the tip of the wing, 

 measured parallel to the longitudinal axis. 



The figures and descriptions of those species not designated as new may be 

 found in the Maine Agr. Exp. Sta. Bull. 200, part IV. 



All the types and some paratypes of the new species are to be found in the 

 Cornell University collection. 



