BLATTID.E PEESERVED IN AMBER, FROM PRUSSIA. 33!J 



Some of the amber-enclosed specimens are coated with an opaque whitish 

 deposit, due probably to a mixture of bodj-juices or of water with the resin 

 in contact with the enclosed insect's body. A few of the insects struggled 

 violently when first entrapped, as shown by the wavy and disturbed ap- 

 pearance of the amber, and this obscures the structural details which it is 

 important for classification's sake to make out. 



I have not figured many of the species in toto, as I do not consider such 

 illustrations of very great value. The species of Phyllodromia and IscJmo- 

 ptera, both fossil and recent, present such a uniform appearance that a 

 careful examination o£ details of wing and tegminal venation, of leg-armature, 

 and of the form of the terminal abdominal segments is necessary to dis- 

 criminate between the numerous forms ; it is these details that I have figured 

 wherever necessary. 



I have succeeded in identifying all the species described by Germar and 

 Berendt, but not those few described by authors who wrote before 1856. 

 and I do not know where the types of these species are preserved. 



Handlirsch in ' Die Fossilen Insekten,' 1906-1908, pp. 694-695, gives ~a 

 complete list of all the species described from amher-inclusa, with references 

 to the literature. 



The numbers quoted under each species are those which Dr. Klebs's 

 •specimens bear; a glance at them indicates the relative abundance of the 

 species. Numbers in italics signify type-specimens. 



Subfam. EcTOBiix.E. 



EcTOBiL's BALTicus, Germ. S,' Ber. (PI. 47. fig. 1.) 



Blatta baltica, Germar & Berendt, Organ. Reste im Bernstein, Bd. ii. Abt. 1, p. 34, 

 pi. 4. fig. .5 (1866). 



c? <S . Nos. 5428, 5429, 5436, 5439, 5465, 5468, 5470, 5474, 5480, 5487, 

 5493, 5496, 5503, .5513, 5521, 5527, 5542, 5554, 5556, 6705, 6723, 6726, 

 6734, 7478, a 1. 



? ? . Nos. 5440, 5457, 5475, 5557, 5560, 6719. 



The species resembles E. lapponicus, Linn., in its coloration, the venation of 

 the tegmina, and the form of the apex of the abdomen. It is distinguished 

 by its smaller size, by the long tegmina and wings of the female, and by 

 the short acuminate genital style of the male. The single genital style in 

 E. lapjyonicus is broad and rounded, and a microscopical examination shows 

 that its apex is furnished on the dorsal side with a tuft of hairs; in E. haUicics 

 the style is like a small pin-point. Three undoubted female examples show 

 that E. halticus differs from all the modern European species in the greater 

 length of the tegmina and wings, these slightly surpassing the apex of the 



