48 Transactions. — Zoology. 



Sub-family PTYCHOPTEEIN^. 



Y-shaped suture of the mesonotum indistmct. Structure- 

 of the ovipositor various. 



Genus Tanydekus, Philippi (1865). 



Head placed at the end of a long cylindrical neck. The 

 rostrum longer than the head ; palpi 4-jointed, the last joint 

 shorter than the penultimate. Eyes pubescent in the female, 

 glabrous in the male ; contiguous in both sexes, no ocelli. 

 Antennse 18-jointed ; the first joint short and cyathiform, the 

 second globular, those of the flagellum cylindrical, the last less 

 than half the length of the penultimate. Thorax with tube- 

 rosities over the wings, but the sutures are not connected 

 across the dorsum. Wings with hairs on the veins ; one mar- 

 ginal cell, five submarginal cells, and five posterior cells. 

 Discal cell closed. Basal cells less than half the length of the 

 wing. Subcostal cross-vein near the tip of the auxiliary. A 

 posterior intercalary vein. Seventh longitudinal vein absent, 

 represented by a short fold. Tibiae with long spurs at their 

 tips. Empodia absent. Ungues smooth. The forceps in the 

 male is large, simple, 3-jointed ; the last joint blunt, without 

 any teeth or horny claw. No ovipositor, but a pair of anal 

 styles. 



In this genus there is a discal cell ; the anterior branch of 

 the second longitudinal vein is forked, and the lower branch 

 of the fork is connected by a cross-vein with the posterior 

 branch. This posterior branch of the second is also connected 

 by a cross-vein with the third longitudinal, thus making five ' 

 submarginal cells. The origin of the third longitudinal is a 

 little beyond the first fork of the second. The anterior branch 

 of the fourth longitudinal is not branched, but the fourth pos- 

 terior cell is divided into two by a posterior intercalary vein, 

 thus making five posterior cells. The length of the discal cell 

 is about four times its breadth. The posterior cross-vein is 

 very oblique. The sixth longitudinal vein is present. The 

 abdomen is narrow and cylindrical, with, apparently, seven 

 segments in the male and eight in the female. 



Tanyderus annuliferus, sp. uov. Plate IV., figs. 21a-21e. 



Brownish-yellow, the joints of the legs and tarsi dark- 

 brown. Head dark-brown. Mesonotum with three dark- 

 brown bands, the pleurae dark-brown. Tips of the balteres 

 dark-brown. Wings nearly hyaline, with brown markings; 

 all the longitudinal veins with hairs in both sexes. The 

 markings on the wings consist chiefly of three brown fasciae 

 containing white spots, one at the base of the wing, another 



