COLLECTION OF BLATTID^ ENCLOSED IN AMBER. 65 



are long. The femora are moderately armed. The production backwards 

 o£ the posterior angles of the meso- and metanotum shows that the adult 

 must be a winged form. 

 Total length 14 mm. 



EUTHYERHAPHA PACIFICA, Coq. 

 Blcdta imcijica, Coquebert^ Icon. Ins. iii. p. 91, pi. 21. fig. 1 (1804). 



One example, No. 58535. 



The specimen is so enclosed in a block of amber that I am not able to make 

 out much of the underside details, and therefore I cannot determine the sex 

 with accuracy. The pronotum has a yellow spot at each posterior angle and 

 the legs are dark castaneous, in which details the specimen resembles modern 

 South African more than any South American specimens which I have 

 seen. 



The present range of the species is South America, Africa (including 

 Madagascar), and Polynesia. 



in. AFRICAN SPECIMENS. 



Unfortunately the geological horizon of these specimens is unknown. 

 I am willing, however, to hazard the opinion that it is much later than the 

 Oligocene period. Only five genera are represented_, viz., Anaplecta, 

 Ischnoptera, Phyllodromia, Periplaneta, and Plectoptera *. The first and last 

 of these genera may be considered as very highly evolved forms ; their 

 wing-structure is — if I may be pardoned the expression — le dernier cri in 

 Blattid wing-evolution ; and though we must exercise the utmost caution in 

 our attempts to determine the duration of a species' existence from an 

 examination of its structure alone, nevertheless I believe that the occurrence 

 of such highly-evolved forms as Anaplecta and Plectoptera in amber is slight 

 evidence in favour of presuming quite a late date for the horizon in which 

 the amber is found. 



All but one of the specimens are recorded from East Africa : the single 

 exception has merely the label " Africa " ; but as this specimen appears to me 

 to be identical with one of the East African examples, I venture to assume 

 that the provenance of all the specimens is the same. It is unfortunate that 

 the exact locality where these specimens were collected is quite unknown. 



Anaplecta sp. 



One male. No. 1 13769, with label "Africa" ; one female. No. I 13761. 

 The numerous species of the genus Anaplecta are of small or minute size ; 

 they exhibit a very uniform type of coloration and the form of the terminal 



* The determination of tlie genus Periplaneta is a little doubtful, as is shown later. 



