MORGAN HEBARD 345 



strongly produced, broader distad, with subchitinoiis area more extensive; 

 lateral margins nearly straight, weakly converging distad where the plate 

 is very broadly truncate with distal margin weakly convex; mesad the 

 entire produced portion of the plate is subchitinous to near the heavy 

 chitinous narrow lateral portions and more delicate chitinous narrow distal 

 portion. 1" Subgenital plate convex except meso-distad, where it is weakly 

 concave and weakly triangularly produced; at the apex of this production 

 is situated a stout cyUndrical style four times as long as broad, directed 

 dorso-sinistrad with blunt apex covered with minute, short, stout, chitinous 

 spines; sinistrad of this stj^le and also on the free margin is situated a small 

 cylindrical style with apex rounded, about half as long and distant from 

 the larger stjde by only its own length; free margin dextrad decidedly 

 convex to base of mesal production, where with the dextral margin of this 

 production a distinct and broadly rounded concavitj- is formed; from the apex 

 of the mesal production the sinistral portion of the free margin is nearly 

 straight and oblique to the base of the plate. 



Allotype. — 9 ; same data as type. [Hebard Cln.] 

 Description of Allotype. — Agrees with male in ambisexual characters, differ- 

 ing in the following features. Size slightly larger, form slightly more robust. 

 Interocular space very slight!}' broader than interoceliar space, both dimensions 

 slightly greater than in male, but distinctly less than in this sex of rufa rnfa. 

 Tegmina and wings proportionately ver}^ slightly shorter than in male, extend- 

 ing well beyond the cereal apices. Dorsal surface of abdomen unspeciahzed. 

 Supra-anal plate rather strongly produced mesad, trigonal but with lateral 

 margins stronglj' concave and apex rounded, the distal portion extending 

 bej'ond the subgenital plate a full millimeter. ^^ Subgenital plate decidedly 

 transverse, con^■px, with free margin evenly and broadly con\ex. 



Measurements (in viillimeters) 



S E 



C _ O ~ 



;q °o Xg =^ 



^ ?- z^ ?^ r- --^ 



Caparo, Trinidad ■^'3 "^ "^ 



Type 16.5 4.4 5.3 19.7 5.3 



Paratypes (2) 18 . 2-19 . 8 4 . 6-4 . G 5.6-5.7 19 . 6-20 . 1 5-5 . 2 



9 



Allotype 19.6 4.9 6 20.7 5.6 



Paratypes ((>) 18 . 2-20 .5 4.7-5.2 5.4-6.4 18 . 8-20 .7 4.9-5.7 



1" Thus indicating a condition nearl}' intermediate between that of morio 

 and that of rufa. 



'1 Though this is the normal condition in the series before us, paratypic 

 females also show individual differences in having the apex narrower or w'ider, 

 and in the degree of concavity of the lateral margins; these latter also are oc- 

 casionally strongh- concave proximad, thence nearly straight convergent to 

 the apex. The material of rufa here studied shows the supra-anal plate of 

 the female to be decidedly variable in form, and of little specific diagnostic 

 importance in the present group. 



TRANS. \U. EXT. SOC, XLII. 



