38 EEV. A. E. EATOjS' ON EECENT EPHEjMEEID.E OR MAYFLIES. 



the fore wing, from the costa to the melius ; neuration opaque (" gray," Hag.), light 

 Trarm sepia-hrown. Length of body, $ 20-22 ; wing, 35-38 mm. 



mth. Vera Cruz (Salle in De Selys-Longchamps Mus.), Veragua (M''Lach. Mus.). 



Etjthtplocia anceps, sp. nov. Plate IV. 7 c (wings, legs, forceps from above). 



Imago {dried), 6 . — Head and prothorax above light pitch-brown, the remainder of the 

 notum light testaceous or pale lutescent. Dorsum dark purplish grey ; venter whitish 

 ochreous : sets?, near their insertion, tinged faintly with light purplish grey and then be- 

 coming transparent white ; forceps white. Fore leg (as an opaque object) with the femur 

 pitch-black as well as the tibia, the tarsus greyish white ; in transmitted light the tibia 

 is piu'ple-grey, the tarsus purplish white. Hinder legs whitish yellow at the knee, light 

 pitch-brown or fuscous. TTings transparent, in tlie disk slightly smoky ; the fore wing 

 tinted more distinctly with pm-plish- or light Roman sepia-grey in the marginal and 

 submarginal areas, especially towards the base : neuration in great measure Eoman sepia- 

 or j)itch-brown, becoming lighter and translucent in its more attenuated portions. Length 

 of body, 6 , about 12 ; wing 13 ; setjE about 26 mm. 



Eab. Eio Mauhes, Brazil (Trail, in M'Lach. Mus.). 



CAMPSURUS, Etn. 1868. 



ninstrotions. Adult, PI. V. 8 a-8/ (details) ; (whole figures) see citations of Percheron 

 and Pictet under C. albicans & dorsalis. 



Adult. — Discal cellules of the fore wing large, nearly as wide as long ; the intercalated 

 nervures, constitutiug branches of the cubital (5), pra?brachial (6), and often of the anal (8) 

 nervxires, are convergent mutually into fascicles towards the base of the fore wing ; the 

 anal nervure is somewhat sinuous, and its course from the wing-roots is at first close 

 alongside of the first anal nerviu-e. Fore leg of 6 shorter than the head and body 

 together ; the tarsus longer than the femur, which is about ^ as long as the tibia ; the 

 ungues unequal, dissimilar, ligulate and flaccid, are unusually long. Aperture of the 

 anterior thoracic spiracle patulous, subtriangular, with the angles obtusely rounded, and 

 with the anterior border rovmdly salient ; that of the posterior spiracle very large, 

 exceeding the anterior in its dimensions, widely patulous, ovate, narrowed below. 

 Setse two ; in j about 3^ as long as the body, divaricate in di'ied examples, and glabrous 

 with the exception of a very few scattered hairs near the tips ; in $ about as long as 

 the body, smooth, and glabrous, d , eyes small, oval, mutuaUy remote ; foremost oceUus 

 much smaller than the others. Forceps-limbs inserted each upon a separate basis, above 

 and distinct from the posterior ventral margin of the 9th segment, and not upon a 

 deflexible lobe prolonged from the margin ; unless these bases be taken to represent 

 proximal joints, the limbs are jointless. Penis extruded, commonly decui'ved, sometimes 

 provided with well-developed stimuli. Xo prpjections usually at the hinder lateral angles 

 of the abdominal segments. 



Nymph unknown. 



Distribtdion. Texas to Brazil. 



Type. C. latipennis (in Falingenia), Walker. 



Etymology, ku/x-toj and ovoa, from the divarication of the d setae, after death. 



