30 SJOSTEDTS KILTMANDJAKO-MERII EXPEDITION. 17: 2. 



Usambara: Mombo (June). One female. Previously recorded from Mozambique 

 and Nvassaland, 



Fam. Blattid*. 



The old-world genera of BlattidBe with the posterior metatarsus longer than 

 the remaining joints and the tibial spines in three rows may provisionally be distin- 

 guished as follows : 



1. Tegmina of J" reduced, sometimes very short, wings present or absent; of 

 ? reduced, sometimes quadrate, never squamiform. 



Blatta L. 



Type orientalis L. 



2. Tegmina and wings of d" longer than body, no scent-glands opening on 1** 

 abdominal tergite, mesonotum and metanotum with short backwardly directed pro- 

 cesses. Tegmina of ? quadrate, wings absent, penultimate tergite not concealed b}^ 

 antepenultimate tergite. 



Ctartoblatta gen. n. 



Type piilchm sp. n. 



3. Tegmina and wings of J longer than body, scent-gland opening on 1^^ ab- 

 dominal tergite, mesonotum and metanotuiii with long backwardly-directed processes. 

 Tegmina of ? squamiform, wings absent, penultimate tergite almost concealed by 

 antepenultimate tergite which is depressed and declivous. 



Pst'uclodei'opoltis Krauss. 

 Type antennata Sauss. 



4. Tegmina squamiform in both sexes, in ? penultimate tergite not concealed 

 by antepenultimate tergite, which is not declivous. 



Stylop.vga FrscH. 

 Type rhomhifolia Stoll. 



5. Tegmina and wings longer than the body in both sexes: pronotiim trape- 

 zoidal, anterior border arcuate, sides deflexed. 



Pei'iplaiieta Burm. 



Type americana L. 



6. Closely allied to Periplaneta but the pronotum elliptical, the anterior border 

 truncate, sides not deflexed. 



JHoiiialosilplia Stal. 

 Type KstuJala Burm. 



It is not easy to separate females of Stylo p>/ga from females of FseHdoderopellis, 

 the declivous 6*'^ abdominal tergite almost entirely hiding the 7*'' tergite is perhaps 

 the most distinctive feature of the latter genus, giving the insects a peculiar truncate 



