308 Journal New York Entomological Society. [Voi. xxi. 



the head and composed of finely divided filaments (figs. / and A). The 

 pupa is not very active and lies much of the time on its side at the 

 bottom of the glass with the abdomen bent under until the caudal fin 

 touches the head and occasionally it moves the abdomen rapidly back 

 and forth, causing the caudal fin to beat against the respiratory plumes 

 as if to create currents of water over them. The lateral margins of 

 all the segments of the abdomen, except the first, have two brown 

 dashes. There is a prominent dark spur on the posterior lateral mar- 

 gin of the eighth abdominal segment which ends in three slender 

 teeth (fig. g). The anal appendage has an inner dark margin and an 

 outer fringe of rather long hairs. The length is about 9 mm. 



The adult which bears a close resemblance to both C. decorus and 

 C. dorsalis has heretofore in American collections been confused with 

 the latter species from which it differs in the form of the tgg mass, 

 in the character of the labium of the larva, and in the hypopygium 

 of the adult. It may be distinguished from C. decorus by the form of 

 the labium of the larva and by the coloring of the adult. 



The following description of the imago has been furnished for 

 publication here by Dr. O. A. Johannsen. 



C. cayugae new species. 



Male. — Length 6-6^ mm. Head and frontal tubercles pale yellow, palpi 

 and antennae including the large basal joints fuscous. Antennae 12-jointed, 

 the twelfth segment about three times as long as the ten preceding ones. 

 Thorax and scutellum pale yellow, the humeri greenish, stripes on mesonotum 

 dark chestnut brown, pectum and metanotum fuscous. Abdomen fuscous, the 

 first segment greenish yellow with a more or less distinct brown transverse 

 fascia ; segments 2, 3, and 4 with the apical third of each, yellow ; fifth seg- 

 ment with a narrow yellow apical margin. Hypopygium as in C. decorus (see 

 PI. 32, fig. 13, Bui. 86, N. Y. State Museum), the superior forceps being strongly 

 curved. Legs yellow, the fifth and the tips of the other tarsal joints' and of 

 the tibiae brownish. The joints of the fore leg beginning with the femur bear 

 the relations to each other as 41, 37, 58, 30, 23, 20, and 11. Fore tarsi without 

 long hairs ; pulvilli extend beyond the middle of the claws on all the feet. 

 Wings hyaline, cross-vein brown, costa and R4+5 end together a short distance 

 from the tip of the wing ; cubitus forks under the proximal end of the 

 cross-vein. 



Female. — Like the male in color except that the paler margins of the ab- 

 dominal segments are narrower and covered with a grayish bloom. The an- 

 tennae are 6-jointed, the fore metatarsus is slightly over 1.6 times the tibia in 

 length, and the cubitus forks slightly distad of the proximal end of the 

 cross-vein. 



