94 THE BLATTIDAE OF PANAMA 



Compared with females of A. carinulata (Saussure), known only 

 from Costa Rica, the female at hand is found to differ in its vastly 

 greater size, slightly broader form, more strongly truncate teg- 

 mina, less convex face, greatly reduced arolia, paler vertex and 

 even more weakly paler lateral margins of the pronotum and costal 

 field of the tegmina. 



Type. — 9 ; Gatun, Canal Zone, Panama. July 28 to x\ugust 5, 

 1916, (D. W. Harrower.) [Hebard Collection, Type no. 492.] 



Size very large, form broad for the genus. Head with vertex smooth, projecting 

 beyond pronotum, rounding suddenly into the smooth and flattened, weakly con- 

 vex, face; interocular space very broad (2.7 millimeters), only slightly narrower than 

 that between antennal sockets; ocelli represented by small dots. Antennae slender 

 and very short, length very close to pronotal width; length of third joint slightly 

 over twice its width. Pronotum smooth, surface broadly convex except laterad 

 where it is feebly concave; margin cephalad weakly convex, showing some trunca- 

 tion above head, lateral portions feebly cingulate; latero-caudal angles acute and 

 sharply rounded, forming an angle distinctly less than ninety 'degrees; caudal margin 

 broadly concave on each side, forming a very weak and broadly rounded median 

 production. Tegmina coriaceous, polished, subquadrate, veins appreciable only, 

 costal margins cingulate; production greatest at costal margin, angle there acute, 

 sharply rounded; distal margin oblique to sutural margin, angle there obtuse, 

 rounded, thus leaving a brief median portion of the metanotum exposed. Abdomen 

 with median width greater than width of any other portion of insect; dorsal surface 

 polished, distal half of each segment with small, very low, longitudinal ridges 

 (maximum number twelve), the latero-caudal angles of each segment produced in a 

 minute sharp tooth. 



Supra-anal plate polished but microscopically irregularly striate, about half as 

 long as proximal width, lateral margins broadly convex to a small obtuse-angulate 

 median emargination, before which the surface of the plate is very briefly sulcate. 

 Cerci very short and stout, tapering sharply in distal portion to acute apex; dorsal 

 surface moderately convex and polished, showing the sutures of seven segments, the 

 lateral margins of which are feebly convex; ventral surface strongly convex, clothed 

 heavily with short stout hairs and a few very elongate slender hairs, lateral margins 

 broadly deplanate, the external slightly more than the internal. Subgenital plate 

 large, broad, evenly convex and polished; its free margin slightly within the lateral 

 margins of the sixth dorsal abdominal segment and closely following the free margin 

 of the supra-anal plate, broadly and feebly concave at the cereal bases, the con- 

 vexity greatest between the cerci. 



Cephalic femora with ventro-cephalic margin armed with four heavy and moder- 

 ately elongate spines, succeeded by a series of modcrateh' widely spaced small 

 chaetiform spines, terminating in two heavy spines, of which the more distal is twice 

 the length of the more proximal; ventro-caudal margin armed with (three and four 



