SIALID^. 



G05 



Tula 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 ruhicundula Fabr. 

 is a very abundant spe- 

 cies, being yellowish red. 

 Diplax Berenice Drury 

 (Fig. 589, male; fig. 590, 

 female) is black, with the ^'s- ^^h 



head blue in front, spotted v.ith j-ellow, while the thorax and 

 abdomen are striped with yellow. There are fewer stripes on 

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



w ith the head yellowish aad 

 ^,^;^:f^^ with greenish j^ellow spots 

 on the sides of the thorax 

 and base of the abdomen. 

 The Nannophya bella of 

 Uhler (Fig. 592) is a smaller 

 form, with an unusually 

 short abdomen, and the 

 reticulations of the wings 

 are large and simple. It is 



Fig. 590. 



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



SialidjE Leach. This famity is not a numerous one, but the 

 species are interesting as comprising some of the largest of in- 

 sects. Hagen defines the group briefly 

 as having the body short and thick, 

 while the prothorax is large and square. 

 The antenme are long and setaceous ; 

 the wings are large, reticulated, the pos- 

 terior ones with the anal space plicated, 

 and the tarsi are fiA^e-jointed. 



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

 an immense quantity of eggs, which she attaches one by one 



^ y'ri 



rig. 592. 



