REVISION OP STKEPSIPTERA — PIERCE. 89 



i. CffiNOCHOLAX FENYESI, new species. 



Described from four males collected by Dr. A. Fenyes, at Cordoba, 

 Mexico, May 21, 1908 (fig. 3, nos. 3, 4; pi. 1, figs. 7, 8, 9, 10, 11). 



Male. — Length 1-1.5 mm., wing expanse 3.25-3.5 mm. Dark 

 brown, wings slightly infuscated, veins strong. Head transverse, 

 considerably wider than thorax, eyes very large, faceted. Occiput 

 prominent bearing the antennas on each side. Antennae seven- 

 jointed; the first two joints transverse, cylindrical, cupped; third 

 joint transverse, cupped, but produced outwardly beneath in a long 

 flabellum, which is almost as long as the metathorax; fourth joint 

 transverse, cylindrical; fifth elongate five-sixths as long as the 

 width of the head; sixth seven-tenths as long as the fifth and slightly 

 surpassed by the flabellum of the third; seventh four-fifths as long 

 as the fifth. Face almost as wide at the thorax; mandibles arising 

 at posterior corners of face at edge of eyes, chitinous, elongate, slender, 

 and acute, almost as long as the sixth joint of the antennas; maxilla? 

 arising just behind the mandibles on the posterior margin of the oc- 

 ciput, the maxilla proper being a large globular fleshy organ, very 

 sensitive, and bearing on the outer side about the middle a long 

 slender palpus, almost twice as long as the mandibles and nearly as 

 slender; oral orifice at a considerable distance from the bases of the 

 appendages ; occiput merely a narrow basal band. Thorax as in other 

 genera, except that the scuti are united for some little distance in 

 the middle behind the praescutum; balancers long. Wings with 

 six primary veins; the first two consisting of the very short basal 

 costa and the subcosta reaching the middle of the anterior margin; 

 the third ( radius) lies very close to the subcosta,- runs parallel to it 

 and considerably beyond and becomes thickened toward its apex; 

 below the apex of the radius and close to it is a short, thickened unat- 

 tached branch; the fourth primary (medius) is united to the radius 

 at its base, but diverges rapidly, and only extends one-third of the 

 distance to the margin; immediately below the medius and beginning 

 about its middle is an unattached vein which runs parallel to the 

 medius to its apex and thence straight onward to the outer margin; 

 the fifth primary (first anal) diverges from the medius at almost twice 

 the angle between radius and medius; the sixth primary (second anal) 

 is shorter and united with the preceding for a little distance at its 

 base. Front and middle coxae transverse; trochanters arising at the 

 sides and longer than the femora; tibiae about as long as the femora; 

 tarsi short, hardly more than half as long as the tibiae, with the first 

 joint cylindrical and as long as the three following, these three joints 

 with pubescent pad beneath as in other genera. Posterior coxas 

 prominent, cylindrical; trochanters short. Tenth dorsal segment of 

 abdomen a large, broad, almost circular plate, wider than the preced- 

 ing segments and completely covering the ninth ventral. Ninth 



