708. 

 EPHEMERA COGNATA. 



The large May-fly. 



Order Neuroptera. Fam. Ephenieridae. 



Type of the Genus, Ephemera vulgata, Linn. 

 Ephemera Linn., Fab. 



Antenna very short, inserted in large cavities in front of the face (1* 

 a), triarticulate, basal joint the thickest, 2nd stout and oblong, 

 3rd a long seta somewhat fusiform at the base, the apex subovate 



Tropin imperfect, soft and filled with fluid. 



Maxilla each forming a compressed, elongated, sublinear lobe, 



rounded at the apex (4). Palpi larger, triarticulate ? basal joint 



large, 2nd and 3rd small subglobose (p). 



Mentum short, dilated anteriorly. Palpi ? forming 2 large, fin- 



like lobes (5). 

 Head rather broad and short : eyes large and remote in both sexes : 

 ocelli 3, forming a triangle in front of the head (l*o), remote, 2 very 

 large, the lower one smaller {l"^ front vieiv of head). Thorax very 

 long and narrow, oval : scutel rather small and gibbose. Abdomen 

 long and sublinear, the apex furnished with 3 very long slender fila- 

 ments, composed of numerous joints (7 f), the central one a little 

 the shortest in the male, in which sex there is also a pair of curved 

 triarticulate appendages, the 2 apical joints small and subovate (c). 

 Wings erect in repose, reticulated with nervures ; superior ample, 

 elongate -trig onate ; inferior small and oval. Legs short, the ante- 

 rior very long in the males (8): thighs short and compressed: 

 tibiae short and attenuated, anterior very long and slender in the 

 males as well as the tarsi, which are 5 -jointed, basal joint very short, 

 2nd very long, the following slightly decreasing , the 4 first joints 

 are very short in the other tarsi : claws, anterior forming 2 equal 

 lobes, the others with one large lobe and one claw, notched at the 

 apex (t, a hind leg). 

 Metamorphoses quadruple. Larvae with 6 feet, 12 lateral lobes, and 

 3 setaceous ciliated tails. Pseudimago similar inform to the per- 

 fect insect. 



CoGNATA Step. — Curt. Guide, Gen. 734. 2. 



Head and thorax piceous, with several yellow spots on the 

 latter, formed by membrane ; sides of the collar orange, with 2 

 yellow stripes behind them : abdomen ochreous, with a dark 

 waved line down each side, and 2 long piceous spots on each 

 of the 2 or 3 terminal segments, the edges of all yellowish- 

 white : wings transparent, stained greenish-yellow, with 3 

 fuscous spots on the disc and 1 near the base ; nervures pi- 

 ceous : legs yellowish, all the articulations with piceous spots 

 at the apex. 



