MORGAN HEBARD 21 



When compared with the species of apparently nearest relation- 

 ship, A. hivittata Brunner,2o the present insect is found to have the 

 head differently marked, the vertex not being solidly dark, the 

 tegmina differently bicolored and lacking a distinctive meso-prox- 

 imal dark blotch and the male genitalia showing very distinctive 

 features. 



Compared with A. analisignata Rehn, the present insect is seen 

 to be larger with very different head and tegminal color pattern. 21 



The tegminal coloration in the present species is very distinctive, 

 though undoubtedly derived from the same type as that found in 

 gemma, bivittata and analisignata. 



Type. — d" ; Corozal, Canal Zone, Panama. November 17, 191 3. 

 (M. Hebard.) [Hebard Collection, Type no. 430.] 



Size small, form slender, slightly more so than in .4. azteca or ^1. asema. Head 

 distinctly longer than broad; ridges above antennal sockets distinct, not as decided 

 as in asema, not as weak as in ^ . sordida ; ocellar spots distinct. Pronotum rectangu- 

 late-oval narrowing very slightly more cephalad than caudad; surface weakly con- 

 vex, showing small but distinct latero-caudal transverse sulci of the disk.- Teg- 

 mina narrow; costal margin weakly con\-ex to the narrowly rounded apex; costal 

 veins numerous (twelve), simple; discoidal sectors few (five).^^ Wings moderately 

 broad; costal veins (seven; seven to nine in the series) strongly clubbed distad; 

 medio-discoidal area large with two (to three in the series) transverse veinlets, 

 the more distal oblique and sending from near its base at the median vein a weakly 

 oblique longitudinal branch distad; appendicular field in length about two-fifths 

 that of remaining portion of wing, length equal to width. 



Supra-anal plate moderately transverse; lateral margins convergent, rounding 

 broadly into distal feebly convex portion without angulation, supplied with numer- 

 ous hairs; dorsal surface highly specialized as in asema. Subgenital plate produced 

 scoop-shaped, lateral portions perpendicular: sinistral margin straight produced 

 and weakly declivent to a ver>' wide, more strongly declivent and oblique socket, 



20 A single male of this species, recently recorded by Rehn from Igarape-Assu, Brazil, 

 in the Academy Collection, is employed for this comparison. ^ 



2' The abdomen is missing in the type and genital comparisons in consequence can not 

 be made. In the remaining described species of the group, A. pallida Bolivar, the teg- 

 mina are uniform testaceous. 



22 In forms of the present genus in which these sulci are more distinct, smaller latero- 

 cephalic transverse sulci are sometimes feebly indicated. 



23 In some specimens of the series an additional longitudinal vein is weakly defined, 

 distad only, between the discoidal and median veins. This is true for many species of 

 the genus. The number of discoidal sectors varies individually, occasional specimens 

 showing an ulnar ramus or a supplementary ramus of the median vein. The unimpor- 

 tant character of these is shown by the fact that such rami are frequently found in one 

 tegmen and not in the other of the same specimen. 



MEM. AM. ENT. SOC, 4. 



