448 



THE STUDY OF INSECTS. 



them. The transformations are undergone within the lump 

 of resin. After the gnats emerge the empty pupa-skins pro- 

 ject from the lump of resin as shown at the right in Figure 

 526. In this figure the gnat, a single wing, and a part of 

 the antenna of each sex are represented, all greatly enlarged. 



Family RHYPHID.E (Rhyph'i-dae). 

 The False Crane-flies. 



The false crane-flies are so called because they resemble 

 the Tipulidae somewhat in the venation of the wings, the 



FIG. 527. Wing of Rhyfhus. 



three branches of vein V being preserved, and cell V, being 



divided by a cross-vein (Fig. 527). They lack, 



% however, the V-shaped suture on the thorax 



1| that is characteristic of crane-flies; and differ, 

 | also, in having ocelli, and in the structure of the 

 | antennae (Fig. 528). The wings are wider than 

 if is usual with crane-flies, and the branches of 

 F.G. 528 . l vein In separate nearer the base of the wing 



than in that family. 



The adults are mosquito-like insects with spotted wings, 

 which often enter houses, where they are found on windows. 

 We have also observed them in considerable numbers just 

 at nightfall, feeding on sugar which had been placed on 



