TRYXALIN.E. 27 



basally ; prostemum without tubercle ; lateral carinae 

 well developed, considerably diverging posteriorly. 

 e. Fastigium of the vertex acuminate, without longitudinal 

 carina ; tegmina considerably surpassing tip of abdo- 

 men, without regular transverse veins in discal area 

 and on costal margin; antennae with the basal joints 



depressed « . Eapagoa, Bruner. 



ee. Fastigium of the vertex somewhat obtuse, with longi- 

 tudinal carina ; tegmina but little surpassing tip of 

 abdomen^ with regular transverse veins in discal area 

 and on costal margin ; antennse filiform, but little 



flattened basally . Syrbula, Stal. 



cc. Hind tibiae armed with fewer spines on outer margin, rarely 

 numbering as many as 15, usually only 10-12. 

 d. Radial veins in apical third of wing {<$) normal, not 

 constricted nor especially incrassate, the discoidal field 

 not fenestrate. 

 e. Head usually more or less conical, ascending, sometimes 

 strongly ; eyes generally prominent ; upper portion 

 of the frontal costa produced so that the front when 

 seen laterally is more or less sinuate or angulately 

 bent inward at the ocellus ; wings usually banded or 

 highly coloured. (Acrolophiti.) 

 /. Head, when viewed laterally, strongly ascending; 

 face below ocellus subperpendicular ; antennae more 

 than half as long as the tegmina ; metazona dis- 

 tinctly elevated above the prozona, tumid or crested. 

 g. Metazona much longer than prozona, with an 



elevated but tumid crest Acrolophitus, Thomas. 



gg. Metazona but little longer than prozona, tumid, 



but with only a slight carina ........ Acrocara, Scudder. 



ff. Head, when viewed from the side, with scarcely 



ascending vertex; face below ocellus distinctly 



though not greatly oblique ; antennse less than half 



as long as tegmina ; metazona not or barely elevated 



above the prozona, feebly tumid at most. 



g. Antennae much longer than the face ; lower margin 



of lateral lobes of pronotum anteriorly excised, 



broadly exposing the pleura .; basal half of tegmina 



rather densely reticulate, the intercalary vein 



obscure Mach^socera, Saussure. 



gg. Antennae shorter than the face ; lower margin of 

 lateral lobes of pronotum nearly horizontal 

 throughout, scarcely exposing the pleura ; only 



Ee 2 



