EM1BT0PTET?A OF THE. NEW WOULD ROSS 425 



based upon present standards. Through the great kindness of Dr. 

 Max Biraben, of the La Plata Museum, the holotype of trachelia^ as 

 well as other specimens of the species, have been made available to the 

 writer. The following description and the accompanying figures are 

 based upon this Navas holotype. 



Male (holotype, on slide). — Head, antennae, pterothorax, legs, 

 wings, and abdominal terminalia medium chocolate brown; abdo- 

 men lighter brown; prothorax pale yellow; mandibles amber yellow, 

 with brownish apices and inner margins ; submentum reddish brown. 

 Length 11.5 mm. ; forewing length 7 mm., breadth 1.8 mm. 



Head (fig. 32) large, broad, quadrate ; eyes rather small, not strongly 

 inflated, facets small, interspace equal to four eye widths; sides be- 

 hind eyes two eye lengths long, nearly straight, gradually convergent, 

 evenly rounded behind; caudal margin broad, obtusely rounded 

 medially; mandibles similar to other species of Pararhagadochir\ 

 submentum with form as illustrated (fig. 33). 



Wings with general features and venation similar to trinitatis from 

 Colombia (pi. 18, B) but with three cross veins between Ri and R2+3 

 in forewing, four in this position in hindwing; one cross vein be- 

 tween R2+3 and E.4 in both wings, this vein bordered by white. 



Hind basitarsi with two sole-bladders, the second being very small, 

 indistinct. 



Terminalia (figs. 34, 36, 37) : Left tergal process (10 LP) (fig. 37) 

 greatly elongated, as long as width of 10 L, outer margin jDerpendicular 

 to caudal margin of 10 L, parallel-sided ; apex with a slender, gradually 

 arcuate, talonlike inner process and an evenly rounded, submem- 

 branous outer lobe. Major right tergal process (10 RPi) gradually 

 tapered, bifid apically, the upper apex produced as a slender, sclerotic, 

 downwardly curved spine, which is subtended by a vertical, mem- 

 branous, disklike appendix. Ninth sternite (H) somewhat longer than 

 broad, sides straight, parallel; process (HP) short, truncate, trans- 

 versely wrinkled. Composite right cercus-basipodite and paraproct 

 (RPPT + RCB) veiy dark brown, forming a half ring beneath base 

 of left cercus, elongated toward left and fused to side of HP. Com- 

 posite LCB and LPPT fused at base and inner side to H and HP, 

 heavily sclerotized, without subechinulations on surface, inner apical 

 angle with point indefinite. Cerci with form as illustrated, basal seg- 

 ment of right cercus almost wholly unpigmented. 



Holotype. — Male, on slide,* deposited in the La Plata Museum, 

 Argentina. 



* When received the holotype was mounted dry on a pin. The specimen was caiefuUy 

 cleared in KOH (except one pair of wings) by the writer and mounted with the original 

 labels on a slide in balsam to reveal specific details and to protect it from possible future 

 damage. 



