Mr. R. Shelford’s Studies of the Blattide. 249 
the type. Kirby (1904) employs the name Pseudomops for 
all the South American species placed by various authors 
in the genus Thyrsocera, six Oriental species are placed in 
the genus 7hyrsocera and fourteen in the genus Hemithyr- 
socera. Rehn (1904) also applies Psewdomops to the Neo- 
tropical species, but sinks Hemithyrsocera as a synonym of 
Thyrsocera, spectabilis being selected as the type of that 
genus. An examination of most of the species on which 
these conclusions are based brings to light the following 
facts :—i. Thyrsocera spectabilis, Burm.,is a Periplanetine, 
as shown by the valvular character of the last ventral 
segment of the female and by the wing-structure ; E/ip- 
sidium speciosum, Wlk., the type of which is in the Oxford 
Museum, is closely allied. Dr. A. Brauer, director of the 
Berlin Zoological Museum, has kindly favoured me with a 
drawing of Burmeister’s type and a sketch of the sub- 
genital lamina of that example, and there can be no 
doubt but that Zhyrsocera, Burm., is a ditypic genus of 
the sub-fam. Periplanetine. 
Thyrsocera may be re-described as follows :— 
THYRSOCERA, Burm. 
Antenne incrassated in the basal half and hirsute, the hairs being 
longer and more dense on eight to ten joints just beyond the middle 
of the antenne forming here a conspicuous tuft; third joint not 
longer than second. Head projecting slightly beyond the vertex ; 
eyes and antennal sockets equally widely separated. Pronotum, 
smooth, trapezoidal, sides deflexed. Tegmina extending considerably 
beyond the abdomen with the marginal field broad, the veins in the 
basal part indistinct, marked by series of punctures, Wings with the 
basal half of the marginal field coriaceous, both radial and ulnar 
veins multi-ramose. Front femora with a serried series of short spines 
on the anterior margin beneath, with one or two spines only on the 
posterior margin, the other femora sparsely armed, all with apical 
spines on both margins and genicular spines. Tibize with spines in 
three rows above. Metatarsus equal in length to the remaining 
joints. Supra-anal lamina quadrate, cucullate with a median carina, 
its posterior border emarginate ; sub-genital lamina of usual Peri- 
planetine type. Cerci of moderate length, flattened and spatulate. 
Males unknown. 
The two species may be distinguished as follows :— 
Three joints beyond the antennal tuft white. Pronotum broadly 
