Vol. xxii] ENTOMOLOGICAL NEWS 



vealed the venation poorly preserved in the basal part, but well 

 enough preserved in the outer two-thirds to show the points 

 of origin of sectors, the number of included cell rows, the 

 points of doubling of the rows. I made careful comparison 

 with the wings of adult Bayadcra indica from the same local- 

 ity, and found such close likeness in every part as to leave 

 scant doubt as to the species and none at all as to the genus. 

 Ante- and post-nodals in the fore wing were 24 and 21 re- 

 spectively and the cross veins behind the stigma were, in fore 

 and hind wing, 5 and 6 respectively. 



In examining the costal region of the hind wing I noticed 

 that the outer edge of it was thinly clothed with intermingled 

 hairs and flat scales. 



At the middle of the inner face of the mandible in this spe- 

 cies there is a tooth surrounded in part by thin membrane at 

 its base and perhaps more or less movable, comparable to the 

 articulated appendage to be described in the next species fol- 

 lowing. 



Unknown nymph from Jamaica (PI. IV, figs. 8-12). 



A few immature nymphs from Wag-water River, Jamaica, 

 Mar. 7 and 10, '77., M. C. Z., 329 and 322. 



Length 15 mm., abdomen 9 mm., gills 5 mm.; width of head 2.5 mm., 

 of abdomen 2 mm. 



Body rather stout, somewhat depressed. Head squarish, the hind 

 angles a little less prominent than are the eyes at the midlateral mar- 

 gins. Hind margin concave between the obtuse hind angles. Top of 

 head very flat. Frontal ridge, border of labrum and external lobe of 

 the mandible finely denticulate. Antennae 7-jointed, the segments from 

 base outward being as to length in the following ratio: I :3 :2 :i.5 :i.2 :i : 

 .6. Labium as in Bayadcra. 



Thorax depressed. Legs short, stout, thinly hairy. Wing cases 

 reaching (in these immature specimens) only to the middle of the 

 third abdominal segment. 



Abdomen cylindric, or very slightly tapering, the first and tenth 

 segments somewhat shorter than the intermediate segments. No 

 lateral gills : caudal gills three, each cylindric or somewhat inflated in 

 its basal three-fifths, scarcely triquetral, but with a thin marginal 

 fringe of hairs, the apical two-fifths suddenly contracted and then 

 tapering into a long hairy lash-like point. 



