GompUodesmidae. 1189 



basal part of 2nd Joint long a. slender, narrower than the iinusually 

 broad flagellum; the conspicuous nodiform process of the sinus of the 

 cop. legs of other genera appears here as a rather slender, flattened 

 lateral tooth. Genus Ulodesmus. 



Proc. of st, of 6. sgm. subquadr. or narrower, not extending to the bases 

 of the legs betw. which it is located; cop. legs w. flag. decidedly nar- 

 rower than the basal portion, a with the process of the sinus con- 

 spicuous. 



Proc. of st. of 6. sgm. distinctly broader than long, medianly with a 

 broad, subrectangular excision; flag. of cop. legs short; very broad at 

 base, the slender portion very short, ending in 2 subequal, strongly di- 

 varicate prongs. Genus Mychodesmus. 



Proc. of st. 6. sgm. semicii'cular, triangulär, subquadrate, a. medianly di- 

 stinctly apiculate, or slender; flag. slender from the base or at least 

 with a long, slender, strongly curved or flexuous distal Prolongation. 



Cop. legs enormously elongate, much larger than the unmodified legs ; the 

 flagella strongly decurved, then turned laterad a. expanded, slender a 

 attenuate distad, the apex lying under the carina of sgm. 6. 



Genus Neodesmus. 



Cop. legs raostly shorter than he others, turned mesad so that the flagella 

 cross each other, or at least are not projected laterad; not expanded 

 in the middle, the apices of the flagella lying near the median line. 



Stern, of sgm. 16 of ^5^ w. a small, distinct, subconic process located at 

 the middle of the anter. edge of the post. subsgm.; proc. of sgm. 6 

 twice as long as broad, somewhat narrowed in the middle, the distal 

 Corners prominent, the apical edge distinctly bidentate. 



Genus Tycodesmus. 



Stern, of sgm. 16 unmodified; process of sgm. 6 as broad as long, distally 

 simply apiculate. 



Lateral carinae, especially the anterior, not slopiug in the direction of the 

 dorsal arch, but nearly horizontal; anter. sgms. w. their poster. corners 

 thickened, the very broad marginal calli there not clearly defined mesad. 



Genus Omodesmus. 



Lat. car. sloping nearly in the direction of the the dorsal arch; anter. 

 carinae not thickened ; their marginal calli not broader, clearly defined. 



Preanal scale w. setiferous tubercles greatly enlarged; papilliform, much 

 exceeding the apex; 1. sgm. w. anter. a. poster. margins converging 

 to a somewhat symmetrical a. produced, rounded lateral corner, the 

 apex of which is occupied by the widened marginal callus; sterna of 

 ^ without transv. ridges; stern. of sgm. 15 without a process. 



Genus Gomphodesmus. 



Prean. sc. w. setif. tub. scarcely exceeding the apex; 1. sgm. w. lat. corner 

 not produced, the callus not widened ; sgm. 15 w. a subtriangular pro- 

 cess from the anter. edge of the stern.; sterna of other large forms 

 w. a distinct, transverse medianly interrupted ridge betw. the bases of 

 each pair of legs. 



Flagella of cop. legs extended cepbalad a. downward in a simple a. re- 

 gulär curve, so that their apices lie near their bases a. are directed 



72* 



