MORGAN HEBARD I7I 



Neostylopyga rhombifolia (StoU) (Plate VI, figure 15.) 



1S13. [Blatta] rlioDibifolia StoU. Natuur. Afbeeld. Beschr. Spoken etc., Kakker- 



lakken, p. 5, register p. 14, pi. Illd, fig. 13. [Apparently an immature female; 



no locality given.] 



Stoll's figure shows plainly the distinctive color pattern of the 

 species. The established synonyms are Periplaneta histrio Saus- 

 siire, Periplaneta decorata Brunner and Polyzosteria heterospila 

 Walker. 



This is a large roach, shining brownish black in general colora- 

 tion, beautifully marbled with yellowish-buff (pi. \T, fig. 15). 

 The color pattern and brief lateral tegminal pads readily distin- 

 guish the insect from any other species found in the regions under 

 consideration. 



Characters of Male. — (Moschi, Kilimanjaro, East Africa. ^"^) Size moderately 

 large, form stout. Head much as in Periplaneta americana, but with ocellar areas 

 forming a slightly less obtuse angulation with the interocellar area, ocellar spots 

 very weakl>- indicated. Pronotum weakly convex, yet showing extensive but 

 weak lateral and meso-caudal flattening; margin above head straight, transverse, 

 thence con\-ex divergent to latero-caudal angles, which are rectangulate and sharply 

 rounded; caudal margins of pronotum, mesonotum and metanotum, straight, trans- 

 verse. Tegmina small, lateral pads, extending to slightly beyond caudal margin 

 of mesonotum; surface shining, minutely punctulate, with humeral trunk alone 

 distinct; costal and sutural margins subparallel, each showing a faint convexity, 

 distal margin rounded with apex nearer the costal margin. Wings absent. Dorsal 

 surface of abdomen unspecialized, latero-caudal angles of segments briefly acute- 

 angulate produced caudad, the degree of production slightly increasing caudad. 

 Supra-anal plate chitinous only in very narrow proximal portion, remaining pro- 

 duced portion formed by a delicate whitish integument with free margin convex 

 except mesad, where a deep acute-angulate emargination, with straight, convergent 

 sides, extends fully half the distance to the base of the delicate portion.-" Sub- 

 genital plate small, free margin briefly convex, transverse to base of styles, between 

 these broadly convexo-truncate. Styles symmetrical, very elongate, slender, cylin- 

 drical processes, slightly longer than length of subgenital plate, set in sockets on 

 free margin of the plate at lateral bases of the slightly produced mesal portion. 

 Limbs elongate and slender. Cephalic femora with ventro-cephalic margins armed 

 with a row of heavy and moderately elongate spines, terminating distad in three 



2"^ The exotic series before us, of some forty specimens, shows a very decided pre- 

 ponderance of females. Though several immature males are included, this is the only 

 adult of the sex available. 



-"" The texture and form of this delicate integument shows a general similarity to that 

 found in males of Periplaneta americana, though in that species both production and 

 emargination are much more decided. 



MEM. AM. ENT. SOC, 2. 



