262 BRITISH TYBOGLYPHIM. 



backward, the first pair are comparatively narrow but 

 nearly straight; the second still narrower and more 

 drawn out at the tips, but slightly curved ; the third 

 broader but somewhat more curved ; the fourth still 

 broader but shorter and almost straight ; the fifth 

 considerably smaller ; the sixth larger and broad ; the 

 next three pairs about the largest on the body ; the 

 tenth much like the sixth ; the eleventh considerably 

 the longest and narrowest on the body and drawn out to 

 a long fine point ; the twelfth small but broad, and the 

 thirteenth much like the sixth. There are also a pair 

 of smaller similar hairs on the posterior part of the 

 dorsal surface of the abdomen just w r here it begins to 

 sink towards the hind edge ; another larger pair, 

 further apart and distant from the hind margin about 

 one third of the length of the abdomen ; and finally 

 two pairs of extremely minute, scarcely palmate hairs, 

 less widely separated ; the first somewhat in front of 

 the middle of the abdomen, and the second immediately 

 behind the line dividing the abdomen from the cephalo- 

 thorax. Each of the larger palmate hairs consists of a 

 central stalk or midrib which is hollow, and the 

 proximal end of which is embedded in the cuticle like a 

 feather ; and of a thickened nervure running round the 

 periphery of the leaf -like expansion. From the mid-rib 

 to the peripheral nervure run a number of short 

 transverse nervures, also hollow ; generally about eight 

 to twelve. They are sometimes straight, sometimes 

 curved or bent; often divided so as to form a Y, or 

 two may run together forming a V; occasionally two 

 are joined by a very fine nervure running from one to 

 the other near their distal ends. These transverse 

 nervures do not correspond on the two sides of the 

 body, nor even on the opposite sides of the same hair ; 

 they are wholly irregular. Along each side of the 

 midrib is a line of fine spines, pointing outward, and 

 a similar line of short spines on the peripheral nervure 

 projects beyond the edge of the leaf. 



Rostrum. Bent downward, reddish in colour; the 



