SIALID^. 



605 



hila quadrimaculata Linn. (Fig. 588) is reddish yellow, with 

 four dark clouds on the wings which are yellow anteriorly on 

 the base. In Diplax the abdomen is a little shorter than the 

 wings, and is slender, 

 flattened, compressed at 

 the base, while the feet 

 are long and slender. 

 Diplax rubicundula Fahr. 

 is a very abundant spe- 

 cies, being yellowish red. 

 Diplax Berenice Drury 

 (Fig. 589, male; fig. 590, 

 female) is black, with the ^'s- •''^i- 



head blue in front, spotted v.'ith yellow, while the thorax and 

 abdomen are striped with j^ellow. There are fewer stripes on 

 the body of the male. D. Elisa Hagen (Fig. 591) is black, 



with the head j^ellowish and 

 with greenish j-ellow spots 

 on the sides of the thorax 

 and base of the abdomen. 

 The Nannop)liya hella of 

 Uhler (Fig. 592) is a smaller 

 form, with an unusually 

 short abdomen, and the 

 reticulations of the wings 

 ^i^- 5^' are large and simple. It is 



black, while the male is frosted over with a whitish powder. 



SiALiD^ Leach. This family is not a numerous one, but the 

 species are interesting as comprising some of the large.-;t f)f in- 

 sects. Hagen defines the group briefl}^ 

 as having the body short and thick, 

 while the prothorax is large and square. 

 The antennae are long and setaceous ; 

 the wings are large, reticulated, the pos- 

 terior ones with the anal space plicated, 

 and the tarsi are five-jointed. 



"The female of Sialis," according to Westwood, "deposits 

 iin immense quantity of eggs, which she attaches one bv one 



■^■y. 



Fiff. 593. 



