Shelford, Descriptionso^ some new genera and species of Blatüdae. 619 



the cerci which are short and rounded at the apex. Legs uniform 

 piceous, stouter than in the d^, calcar of posterior tibia as long 

 as the metatarsus which is short. 



Total length (cf) 27 mm; length of body (cf) 25 mm, 

 (?) 25,9 mm; length of tegmina (cf) 19,5 mm, (?) 7 mm; pro- 

 notum 7 X 9,6 mm. 



German East Africa, Dar-es-Salaam (Oxford Mus., type cf), 

 Amani (coli, du Buysson, type $). 



I have much pleasure in naming this beautiful new species 

 after my friend Yicomte R. du Buysson of the Paris Museum. 



Periplaneta stygia sp. n. 



cf . Piceous. Antennae infuscated, piceous at base. Pronotum 

 of typical form, smooth, without impressions. Tegmina and wings 

 barely exceeding apex of abdomen. Wings dark castaneous, median 

 vein bifurcate, the rami dichotomously branched, a minute apical 

 triangle. Mesonotum and metanotum without membranous pro- 

 cesses. Scent-gland opening on V^ abdominal tergite. Abdomen 

 above castaneous at base ; supra-anal lamina quadrate, posteriorly 

 faintly concave with a V-shaped notch in the middle of the 

 posterior margin. Sub-genital lamina slightly exceeding the supra- 

 anal lamina , quadrately produced , posteriorly emarginate, styles 

 long and slender. 



Total length 24 mm; length of body 23 mm; length of teg- 

 mina 18 mm ; pronotum 6x8 mm. 



Kamerun (coli. B o 1 i v a r , type). 



Deroj?eltis hr evij) ennis sp. n. 



cf . Uniformly piceous. Pronotum finely punctata with a few 

 smooth Spaces, two oblique impressions. Tegmina and wings not 

 extending beyond the third tergite. Scutellum exposed. Supra- 

 anal lamina quadrate, angles rounded, surpassed by the sub-genital 

 lamina. 



?. Uniformly piceous, finely punctate, opaque. Posterior margin 

 of pronotum straight , posterior angles of thoracic tergites not 

 produced. Posterior angles of abdominal tergites not spiniform. 



Length (cf ) 20 — 23 mm , (?) 21 mm ; length of tegmina 

 8,5 — 10 mm; pronotum (cf) 5x7 mm, (?) 5x7,8 mm. 



Erythraea, Asmara. 



The male can readily be distinguished by the short tegmina 

 and wings , the female is very like that of D. cmtraniana Sauss. 

 but is less nitid. 



