1921] NATURAL SCIENCES OF PHILADELPHIA. 225 



few well-spaced, heavy spines, succeeded by a row of (15-17) 

 minute chaetiform spines, terminating in three heavy spines, very 

 elongate, in increasing ratio distad. Ventro-caudal margin of 

 cephalic femora armed with (1 median, 1 subdistal and 1 distal) 

 heavy, elongate spines. Other femoral margins well supplied with 

 heavy elongate spines. Four proximal tarsal joints supplied distad 

 with minute, simple pulvilli. Tarsal claws simple, symmetrical. 

 Very small arolia present. 



Dasyblatta thaumasia new species. Plate IX, figures 9, 10 and 11. 



The many astonishing characters of this insect are discussed in 

 the generic treatment. The male sex only is known. 



Tijpe: &; Para, Para, Brazil. (C. F. Baker.) [Acad. Nat. Sci. 

 Phila., Type no. 5377.] 



In addition to the characters given in the generic description, the 

 following are noteworthy. Interocular space slightly over one- 

 quarter occipital ocular depth, about one-third width between 

 antennal sockets; impressed punctae, the sockets of hairs, particul- 

 arly conspicuous in the inter-ocular-ocellar area. Third joint of 

 maxillary palpi slightly shorter than the large fifth joint, slightly 

 longer than the fourth joint. The hirsute tegmina have, to the 

 naked eye, a coriaceous appearance, due to the fact that the hairs 

 are not visible except under the microscope; area of dextral tegmen, 

 concealed when at rest, without hairs; discoidal sectors (8 and 9) 

 longitudinal. Wings with distal portion of anterior margin hirsute. 

 Metanotum with a minute subchitinous projection mesad on the 

 caudal margin, which is twice as long as broad; large and very de- 

 cided rounded ridges diverge from this across the median segment, 

 terminating before the latero-caudal portions of that segment. 

 Seven proximal tergites with latero-caudal angles rectangulate 

 and sharply rounded. Eighth tergite narrowly visible, normal 

 dextrad but with sinistral folded portion (including the latero- 

 caudal angle) strongly produced beside the super-anal plate to near 

 the cereal base. Supra-anal plate two-thirds as long as proximal 

 width, weakly chitinous in distal portion; lateral margins straight, 

 parallel, to bases of cerci, straight and strongly oblique to within 

 these, the remaining portion roundly produced, showing a weak indi- 

 cation of a symmetrical, trapezoidal contour. Springing from the sin- 

 istral base of the subgenital plate and from within the production 

 of the eighth tergite, a straight, cylindrical, chitinous process ex- 

 tends caudad along the outer margin of the cercus nearly as far as 

 does the supra-anal plate, this process six times as long as thick, 

 with apex moderately enlarged and bearing a cluster of elongate, 

 straight, chaetiform spines. Subgenital plate with all but base 

 of sinistral portion curled upward to just within and beneath sinis- 

 tral cercus, bearing on its internal surface a stout conical project- 

 ion which terminates in several adjacent, very elongate chaetiform 

 spines, directed mesad, the margin of this portion weakly curved, 



