60 MK. B. SHELFORD : THE BRITISH MUSEUM 



The collection under notice may be classified as follows : — 



I. Oligocene species from 



a. East Prussia 2 specimens. 



h. Samland 12 specimens. 



II. Miocene species from Stettin 7 specimens. 



III. Species from Africa, geological 9 specimens *. 

 horizon unknown. 



I have throughout this paper, in order to facilitate reference, quoted the 

 numbers which the individual specimens bear. 



I. OLIGOCENE SPECIES. 



Dr. Klebs's collection must be nearly complete and exhaustive of the Baltic 

 provinces^ for not a single British Museum specimen from this region and 

 horizon can be referred to a new species. 



a. East Prussia. 



IscHNOPTERA GEDANENSis, Germ. Sf Bev. 



Blatta gedanensis, Geriuar & Berendt, Organ. Reste in Bernstein, Bd. ii. Abt. \, p, 33, 

 pi. 4. fig. 4 (1866). 



One male, No. I 13762. 

 Phyllodromia Pfurcifera, SMf. 



PhyllodroiJiia furcif era, fiheUord, J oiu-n. lyinn. Soc, Zool, xxx. (1910) p. 346. 



One female in a state of such poor preservation that identification is very 

 doubtful. No. I 137G3, 



b. Samland. 



Nearly all of these specimens are larva?^ which it is impossible to refer with 

 any degree of certainty to species described from adult forms. Even when 

 the entomologist is dealing with modern species the allocation of larva? to 

 their adult forms is attended with great difficulty, unless he is aided by 

 careful field-observations and accurate data ; it will be readily understood 

 that the difficulty is enormously increased when the material in the ento- 

 mologist's hands is fossil. Very young larvfB were easily trapped in the 

 resin which flowed from the trees in the Baltic Oligocene forests, but large, 

 powerful adults could free themselves and leave no trace behind. The 



* One of the specimens sent to me is a larval Locustid; this, of course, is not included 

 in the above list. 



