LI BELLI! LI I >.!;. 



. r >97 



much as in the 1 ' c. r I a ri w , and probably with the sides pro- 

 tected near the base by the deflected marginal and scapular 

 (subcostal) areas." Scudder shows that while the venation is 

 much the same as in Hemerobins, as stated by Professor Dana, 

 it also resembles that of the /S tali dee and Ephemeridce and 

 Lihc.llalidw. Gerstaecker thinks that Hemeristia '"at least 

 stands nearer to the Epliem crt-thc than to any other family." 

 (IJronn's Klassen mid Ordnungen des Thier-Keichs, vol. v.) 



LIBELLULID.E Latrcille. Dragon-flies, Devil' s-darning-nee- 

 dles, or Mosquito Hawks, are readily known by the enormous 

 head and thorax, with the remarkably long, slender, cylindrical 

 abdomen. The head is large and globular, with immense eyes 

 often encircling the head. The large square thorax is remark- 



13 C P/, m /\ ^ytf^;:::> 7 



- 



able for the small size of the tergal parts, while the pieces 

 composing the flanks are greatly enlarged, rising up especially 

 in front, taking the place of the prothorax, which is usually 

 very large in the Neuroptera generally, but is in this family 

 greatly aborted, as these insects scarcely ever walk. As in 

 the Ephemeridce the antennae are short and setiform, a.nd 

 the mouth is not furnished with palpi. The wings* are large. 



*FiG. 579. Venation ol' ;i lore wing of Gomphus. Veins. a, a, costal vein: I, 

 subcostal vein; c,c, median vein; d, submedian vein; e, postcostal vein. Sectors 

 (branches springing from area?, veins, cross-veins, or other sectors), fff, princi- 

 pal sector; .</. nodal sector; h. subuodal sector; k, median sector; mm, short sec- 

 tor; n, upper sector of the triangle (normally a prolongation of f/); o, lower 

 sector of the triangle (normally a prolongation of e); o',o", its brandies. (The 

 figure gives. an angle where ' bifurcates from o, which should have been a flow- 

 ing curve. Until n and <> should have been engraved as springing from the lower 



jingle of the triangle, t.) Cross- reins. p, nodus; (/, arc or arculus; rrr. ante- 



cubitals. (The basal anlecubital is wrongly engraved as dislocated with that of 



