826 



AN INTRODUCTION TO ENTOMOLOGY 



eyes are usually divided in both sexes; the upper part of each eye 

 being composed of large facets, characteristic of night-eyes, and the 

 lower part, of smaller facets, characteristic of day-eyes, in a few 



species the eyes are divided only 

 in the males. Figure 1049 repre- 

 sents a section of the head of the 

 Blepharocera tenuipes through the 

 eyes. The antennae are thread- 

 like, but are not furnished with 

 whorls of long hairs (Fig. 1050). 

 The mouth parts are elongate; 

 the females have slender flat- 

 tened elongate mandibles (Fig. 

 105 1 ) the males are without 

 mandibles. The legs are very 

 long. On the dorsum of the 

 mesothorax there is on each side, 

 beginning just in front of the base 

 of the wing, a well-marked suture 

 like that of the crane-flies; but 

 the two do not meet so as to form 

 a continuous V-shaped suture as 

 in the Tipulidse. 



In some species at least there 

 are two kinds of females, which 

 differ somewhat in the shape of 

 the head. These two forms also 

 differ in habits, one being blood- 

 sucking, the other feeding upon 

 nectar. The adults may be found 

 resting on the foliage of shrubs 

 or trees on the margins of mountain-brooks, or dancing in the spray 

 of waterfalls. 



The immature forms of these in- 

 sects are even more wonderful than 

 are the adults. The larvae live in water, 

 in swiftly-flowing streams, where the 

 water flows swiftest. I have observed 

 the transformations of Blepharocera 

 tenuipes, which is abundant in some of 

 the ravines near Ithaca, N. Y. 



The larvae of this species are readily 

 seen on account of their black color, 

 and are apt to attract attention on 

 account of their strange form. (Fig. 

 1052, a). At first sight the body ap- 

 pears to consist of only seven segments, 

 but careful examination reveals the 

 presence of smaller segments alterna- 

 ting with these. Each of the larger segments except the last bears a 



Fig. 1051. — Mouth-parts of female of 

 Bihiocephala doanei: I, ep, labrum- 

 epipharynx; md, mandibles; mx. I, 

 maxillary lobe; mx. p, maxillary pal- 

 pus; hyp. hypopharynx; li, labium; 

 pg, paraglossa. (From Kellogg.) 



Fig. 1052. — Blepharocera: a, larva, 

 dorsal view; b, larva, ventral 

 view; c, puparium, side view. 



