CAEBONIFEROUS COCKROACHES. 407 



sidei'able liumeral space altogether devoid of any trace of veins ; tlie liumeral angle itself 

 is very prominent, nearly rectangular, the extreme angle rounded. The scapular vein, 

 in the part where it is preserved, which does not include the basal third, is perfectly 

 sti'aight, running through the middle of the wing but slightly nearer the costal than the 

 iuner border and slightly oblique, being a very little lower apically, where it terminates 

 at the middle of the tip, than at base ; it begins to branch at the end of the basal fourth 

 of the wing, and emits four or perhaps five straight superior branches, the third before 

 the middle of the wing and the fourth at some distance beyond, or at the middle of the 

 outer half of the wing; the third branch consequently not only emits an inferior offshoot, 

 but the latter is again forked to fill the space between the third and fourth scapular 

 branches. The externomedian vein is exactly parallel to and equidistant from the scap- 

 ular, excepting in the terminal fourth of the wing', where it slightly approaches it; it 

 first divides a little before the middle of the wing, and both these branches, but especially 

 the lower, dichotomize to some extent, but do not diverge widely, so that the inner limits 

 of the externomedian area are not further removed from the tip than those of the scapu- 

 lar. The internomedian vein is obscure, but its branches are scarcely less longitudinal 

 than those of the mediastinal vein and are as closely crowded as those of the externome- 

 dian. The anal furrow strikes the middle of the inner margin, but the anal veins are 

 not preserved. 



The species is a large one, the largest of this group of Palaeoblattariae excepting Necy- 

 mylacris heros, the length of the wing being 29.5 mm. and its breadth 15 mm., or about 

 as 2 : 1. .The specimen is composed of a pronotal shield and the two upper wings, be- 

 sides a cluster of veins of one of the lower wings which, however, are of no importance; 

 the pronotal shield is nearly perfect, and the wings are related to it in the position of 

 repose, showing the whole animal to have been 38 mm. long from the front of the pro- 

 notum to the tip of the fore wings, and 22 mm. in breadth across the middle of the basal 

 half of the wings. A large part of the anterior base of both wings is obscured by poor 

 preservation, the outer half or more of the right wing is wanting, and the left wing lacks 

 all the anal veins and a piece is broken from the apex. The wings may be seen to be 

 transversely wrinkled between some of the veins, but as a general thing they appear to 

 be as smooth as the pronotum, and as if of the same opacity. 



The body is strongly arched, the central portion of the pronotal shield being elevated 

 about 4.5 mm. above the margins and regularly rounded in every direction. Fig. 1 shows 

 a cross section taken slightly behind the middle of the pronotum. The pronotum is 

 very large and broad, being 20 mm. broad and about 10 mm. long, the front very broadly 

 rounded, the sides tapering and convex, the hind margin apparently (from the little that 

 can be seen of it) neai'ly straight but regularly convex; it is rather delicately margined 

 around its lateral and front borders, as shown in both figures. The surface of the pro- 

 notum is entii'ely smooth, excepting in a rather narrow, rather small, subtriangular, cen- 

 tral field, its broken apex at the front margin ; this area is slightly roughened or scabrous 

 and shows slight signs of a median, longitudinal, veiy blunt carina which does not ap- 

 pear in the figure. 



The specimen was submitted to me by Mr. R. D. Lacoe, in whose collection it beai-s 

 the number 2026. Both obverse and reverse are preserved. It occui's in an ironstone 



