26 



side. The remaining segments of these legs are longer than in the 

 two anterior pairs, but their relative lengths are about the same. 

 All three pairs of legs, more particularly the last two pairs, bear 

 numerous spines on the femora, tibiae and tarsi. These spines are 

 rather scattering, with the exception of a row of about fifteen on the 

 inner side of the hind tibia, an oblique row of four or five spines on 

 the outer sides of the middle and hind tibiae, a little beyond the 

 middle of the segment, and about a half dozen spines near the tip 

 of the tibiae of all^three. : pairs of legs. From the upper side of the 

 tip of the last tarsal segment (Plate IV, Fig. 17) a long slender spine 

 arises from a common tubercle. The two curved tarsal claws ap- 

 parently unite at their bases, and articulate on the lower side of the 

 tip of this segment ; between the two claws there is a short knife- 

 blade-like process, pointed at the tip and bearing on the under side 

 a fringe of very delicate hairs. 



The fore wings arise far back on the sides of the mesonotum. 

 They are about as long as the entire length of the body when the ab- 

 domen is fully extended, or about 1.15 mm. long and .44 mm. broad 

 at the widest part. The hind wings arise from the sides of the 

 metanotum anteriorly, and are smaller than the anterior pair. Both 

 wings are provided with a single median vein, that of the posterior 

 wing being nearly straight ; that of the anterior wing being bent 

 toward the posterior margin of the wing at a point slightly beyond 

 the middle. A fold in the fore wing, appearing like a branch of the 

 median vein, is frequently seen arising near its base and extending 

 obliquely toward the posterior margin. The wings are beaded on 

 the margin (Plate IV, Fig. 18), each bead consisting of a minute 

 globule, from the outer side of which two or three minute setae arise. 

 Three or four slender spines arise near the base of the hind wing on 

 the costal margin. 



The abdomen (Plate IV, Fig. 20; Plate V, Figs. 21-23) * s 

 more or less spindle-shaped, and consists of eight segments. The 

 basal segment is small and transverse, sharply separated from the 

 remainder of the abdomen, in which the segmentation is difficult to 

 distinguish except in freshly emerged specimens. The dorsal and 

 ventral plates of the second to the seventh segments inclusive are 

 separated by a pleural membrane, which is capable of considerable 

 extension. In specimens mounted in balsam the ventral plates of 



