ORDER DIPTERA. 



91 



which are popularly called Sand Flies, are exceedingly annoying in 



hot climates. 



Family 4, Bibmiidce.—'&QYQTdX species belonging to this group 

 are very familiar insects. Among them is the St. Mark's Fly {Bibio 



Fig. 125. — Simulium Ornatum (Mag.J 



Marci)^ which is black, with transparent wings in the male and 

 and brownish in the female. 



These flies appear in the spring, and their larvcz live in dung 

 or damp earth. 



Many of the species are popularly called "garden flies." 



Fig. 126. — Bibio Hortulanus (Mag.) 



Family 5, Blephariceridce. — These flies have long legs, the 

 antennce are usually long and slender, and the wings broad and 

 long. The type of this family is BlepJiaricera fasciata, the female 

 of which is a very blood-thirsty creature. It is a dark brown fly, 

 with transparent wings and yellow legs, and it measures about 



