192 REPORT OF STATE GEOLOGIST. 



viated, or wholly wanting. The sub-anal plate of the male is fur- 

 nished with two small styles on its apical margin. In our species the 

 first joint of the hind tarsi is as long as, or longer, than the other 

 joints combined. 



Two genera of the sub-family, each represented by a single species, 

 occur in Indiana. 



KEY TO GENERA OF INDIANA PERIPT^ANETINyE. 



rt. Tegmina of neither sex reaching tip of abdomen, those of the female 

 much shorter. Distance between the eyes gi'eater than length of 



last joint of maxillary palpus VI. Blatta, p. 192 



aa. Tegmina of both sexes much surpassing the abdomen. Distance be- 

 tween -stlio eyes less than the length of last joint of maxillary 

 palpus VII. Peuiplaneta, p. 105 



VI. Blatta* Linnffius (1758). 



In this genus the eyes are farther apart than, the scrobes or pits 

 in which the autennro arc inserted. The tegmina of the female are 

 very short in both sexes and their outer border is le&s rounded than 

 in Periplancta. 



11. Blatta ORIENT ALis Linnaeus. The Oriental Cockroach. Tlie "Black 

 Beetle." 



Blatta orimtallx L., 8 1,1, 1758, 184; Harr., 72, 18fi2, 145, Fig. 66; 

 Rathv., 109, 1S62, 374, Figs. 4, 5; Caud., 40b, Y, 1903, 234. 



Periplancta orientaliK Burm., 40, II, 1838, 504; Brann., 37, 1865, 226; 

 Riley, 122, n, 1884, 172, Figs. 246, 248; Id., 126, n, 1890, 

 267; Comst., 4 1,1, 1888, 93; Fern., 53, 1888, 52, Fig. 21 ; Hyatt 

 and Arms., 7 7, 1890, 102, Plate IV, Figs. 54, 55; BL, 8, 1893, 

 156; Id., 16, 1899, 199, Fig. 41; Marl. 85, 1896, 91, Fig. 41; 

 Id., 86, 1902, 9, Fig. 4; Lugg., 84, 1898, 92, Figs. 51, 64. 



Kakcrlar nrimtalis Hcrv., 196, 1839, 72. 



St)jlopi/ga nrlntlall.'^ Sciidd., 14 1, VII, 1862, 416; Id., 18 8,1900, 9; 

 Glov., 62, 1872, Plate I, Fig.s. 5, 6; Plate VU, Fig. 12; Id., 63, 

 1874, 132, Fig. 4; Bent., 3, VI, 1894, 260, Plate V, Figs. 2, 3. 



General color dark mahogany brown, the limbs lighter, the pro- 

 notum without a yellow margin. Female with rudimentary tegmina 

 which do not exceed 5 mm. in length. Male with the tegmina and 

 wings well developed, the former covering three-fourths of the ab- 

 domen, the latter almost as long. Supra-anal plate of the male 

 truncate; that of the female rounded with a shallow notch at the 

 end. 



*Mr. A. N. Caudell has ret-ently shown (Proc. Ent. Soc, Wash., V, 1903, 234), that 

 orie»^a/t« L., is the type species of the genus Blatta; hence, the generic name Blatta is here 

 used instead oi St\il<>i)yga of Scudder's Catalogue. 



