64 Mr. S. H. Scudder on Mesozoic Goclcroaches. 



Mesoblattina, 



proposed by E. Geinitz, as stated,, for two Liassic species of 

 continental Europe, is a most prolific type, a considerable 

 number of English Mesozoic forms falling here, and among 

 others, as remarked above, those figured by Westwood and 

 described by Giebel under the name of Rithma MurcMsoni 

 and R. antiqua. The former of these, as well as a consider- 

 able number of new species, have been sent to me by Mr. 

 Brodie. In this genus the basal sweep of the externomedian 

 and internomedian veins is very noticeable, following as they 

 do the curve of the anal furrow before branching to fill the 

 lower half of the wing. In this respect they remind one 

 strongly of EUsama ; but the wings are much slenderer than 

 there, and, what is of more importance, the anal area is of 

 the normal size, while next the humeral angle is seen a flat 

 unveined field, so frequent in modern cockroaches. To this 

 belong, among others, the following species : — 



Mesohlattina protypa. 



Mesoblattina protypa, Gein. Zeitsclir. deutsch. geol. Gesellscli. 1880, 

 pp. 519, 520, pi. xxii. fig. 1. 



Lias of Dobbertin, Germany, 



Mesoblattina angustata. 



Mesoblattina angustata, Gein. Zeitschr. deutscli. geol. Gesellsch. 1880, 



pp. 519, 520. 

 Blattina angustata, Heer, Viert, uaturf, Gesell. Ziiricli, ix. pp. 288- 



300, pi. fig. 6. 



Lias of Schambelen, Switzerland. 



Mesohlattina dohhertinensis^ Gein. 



Mesoblattina dobberthiensis, Geiu. Zeitschr. deutscli. Geol. Gesellsch. 

 1884, p. 570, pi. xiii. fig. 1. 



Lias of Dobbertin, Germany. 



Mesoh la ttina Mu rch isoni. 



Hithma Murchisoni, Gieb. Ins. d. Vorw. p. 319. Figured by Westw. 

 Quart. Journ, Geol. Soc. Lond. x. pi. xviii. fig. 43. 



Lower Purbecks of Durdlestone Bay, England. 



Mesohlattina antiqua. 



jRithma antiqua, Gieb. Ins. d, Vorw. p. 319. Figm-ed b}' Westw. 

 Quart. Journ. Geol. Soc. Lond. x. pi. xvii. fig. 10. 



Lower Purbecks of Durdlestone Bay, England. 



Mesohlattina elongata. 

 Blatta elongata, Gieb. Ins. d. Vorw. p. 322. Figui-ed by Westw. ■ 

 Quart. Journ. Geol. Soc. Lond. x. pi. xv. fig. 23. 



Middle Purbecks of Durdlestone Bay, England. 



