616 PROCEEDINGS OF TUE NATIONAL MUSEUM. vol.57. 



ments, long, rather soft, yellowish. Frons and epicranium sculp- 

 tured as in C. ovipennis. Ocelli touch each other and are placed in 

 a nearly straight, oblique line, parallel with frontal suture; anterior 

 ocellus just behind ventrolateral part of antennal ring, lower pos- 

 terior ocellus moved upwards into the interspace between anterior 

 and upper posterior ocellus. Meso- and meta-thoracic dorsal plates 

 well developed. Basal plate of cerci circular except anteriorly, 

 where the outline is about straiglit; surface sculptured as in V. 

 ovipennis. Cerci one-third the length of basal plate, contiguous 

 where attached, divergent. 



CYMATODERA UNDULATA Say. 



Hopk. U. S. No. 12299a8 ; mature. Species reared, larval skin and imago preserved. 



(Figs. 10, 94.) 



Similar to C. halteata in size, chitinizations, colors, and hairiness; 

 differs from this species only in the position of the ocelli, the shape 

 of basal plate, and the length of cerci. Ocelli arranged in an angle 

 of 120 degrees where the lower posterior ocellus occurs. Basal plate 

 of cerci subtriangular. Cerci about one-half the length of basaJ 

 plate, contiguous where attached and divergent as in G. halteata. 



CYMATODERA BICOLOR Say. 



Hopk. U. S. No. 10077a; mature. Species reared, larval skin and imago preserved. 



Body subclaviform. Total length, 14 mm. Color of chitinous 

 parts as in G. ovipennis; membranous parts dorsally pink to light 

 red witli yellowish or cream spots above heart and muscle attach- 

 ments; ventral surface and intersegmental membranes yellowish or 

 cream. Setae fine, long, white; numerous on head, thoracic seg- 

 ments, legs and ninth segment, very scarce on other segments. 

 Frons with transversal impression behind clypeus, with a pit behind 

 angulus frontalis, two rather faint oblique lines on each side ol 

 mediocarina, posteriorly transversally aciculate. Epicranium dor- 

 sally with fine longitudinal striation. Ocelli closely set but not 

 touching each other, placed in a straight oblique line parallel with 

 frontal suture, anterior ocellus just behind ventrolateral part of 

 antennal rings. Mandible without any elevation or tooth between 

 retinaculum and apex. Pro thoracic shield transversally aciculate 

 Meso- and meta-thoracic dorsal plates hardly developed. Basal plate 

 of cerci subtriangular laterally with somewhat convex margin; 

 slightly longer than frons, surface smooth. Cerci smooth, slender, 

 about as long as basal plate; distal half divergent, hook-shaped 

 with apex moderately recurved, proximal half fused, stalk-like, me- 

 dia nly and dorsally with an unpaired small protuberance. 



