EMBIOPTERA OF THE NEW WORLD — ROSS 409 



Head (fig. 6) medium sized; with sides behind eyes rather straight, 

 gradually convergent, caudal angles evenly rounded, caudal margin 

 arcuate, not deeply emarginated at postoccipital sutures. Antennae 

 with 22 segments present (incomplete). Mandibles dark reddish 

 brown, grinding surfaces nearly black; left mandible with 3 apical 

 dentations and a large medial tooth on grinding surface ; right man- 

 dible with 2 broad apical teeth and without a medial tooth. Submen- 

 tum (fig. 9) about as long as broad; sides gradually convergent, 

 slightly biemarginate. Ventral bridge as long as submentum. Occip- 

 ital foramen acute apically, longer than broad. 



Wings (pi. 18, A) relatively long and narrow, venation and cross 

 veins as figured; Cum in both wings with two branches, the second 

 branch represented by only a hyaline interveinal line and a row of 

 sparse setae in hindwing. 



Terminalia (figs. 6a and 7) relatively larger and broader than those 

 of aequicercata. Ninth tergite (9) seven times longer than broad, 

 with basal margin broadly biemarginate, not so elongate at median 

 arcuation as at sides; apical margin narrowly membranous throughout 

 most of its width. Tenth tergite rather narrowly cleft to basal mar- 

 gin, cleft broadly membranous basally ; left hemitergite (10 L) rectan- 

 gulate, transverse; process (10 LP) distinct, directed mesocaudad at 

 a 20° angle, sclerotized along outer (left) margin, fleshy along inner 

 margin ; right hemitergite (10 R) larger and broader than 10 L ; proc- 

 ess (10 RPi) an irregular, caudally membranous lobe; inwardly 

 slanting secondary process (10 RPg) very narrow, sclerotic, connected 

 basally with base of 10 RPi. Ninth sternite (H) strongly transverse, 

 basal margin interrupted by two lightly pigmented areas; process 

 (HP) relatively well developed, irregular in outline. Right para- 

 proct obsolete. Left paraproct (LPPT) distinct, extending from 

 base of left cercus to beyond apex of HP, narrow, irregular, lying 

 close to HP throughout its length, expanded apically. An isolated, 

 twisted, small sclerite of undetermined homology projects caudad be- 

 tween LPPT and base of left cercus. Left and right cercus-basipo- 

 dites (LCB, RGB) represented by small, circular, setose sclerites in 

 ventral membrane. Left and right cerci subequal. 



Neallotype female. — Color (on slide) : Head dark chocolate brown, 

 thoracic and abdominal segments progressively lighter brown caudad, 

 terminal segments pale tan; legs uniform light brown, except hind- 

 tibiae and tarsi, which are pale tan. Length 18.5 mm. Head with 

 occipital foramen acutely pointed anteriorly; ventral bridge very 

 pale medially; dorsal pattern obsolete. 



Remarks. — Davis (1942) has placed his intermedia in synonymy 

 with uricM., but the writer prefers to regard intermedia as a mainland 

 subspecies of urichi^ as the Venezuelan specimens studied are larger 



