MUSEUM OF COMPARATIVE ZOOLOGY. 5 



These three strong-winged Acridida^ may then he presumed to have 

 reached tlie islands by flight from the mainland; the remainder, lialf 

 of them apterous in the female sex or altogether, may be presumed to 

 have reached the islands with the flotsam and jetsam of the ocean ; while 

 the poverty of the fauna is distinct evidence that the islands have only 

 been peopled by these methods, and within a relatively recent time. 



That this time is not actually very recent may be inferred from the 

 variation of the same species on the different islands, variations which 

 may be more or less clearly seen in the three species which we assume 

 to have probably arrived through direct flight, but which are the only 

 ones in which we have a fair number of specimens from three or more 

 islands on which to ground an opinion. It is also to be inferred — but 

 less confidently, from our incomplete knowledge of the American fauna 

 — from the fact that outside of these species and the commercially in- 

 troduced cockroaches, there is not a single one of the Galapagos species 

 known upon the neighboring main, time having already permitted specific 

 differentiation through isolation. 



FORFICULIDyE. 



Anisolabis bormansi, sp. nov. 



Plate I. Fig. 1. 



Anisolabis maritima '^ Brun. ! (nee Bon), Proc. U. S. Nat. Mus , XII 192 



Head smooth, piceous ; labrum fusco-testaceous, mouth jiarts testaceous; 

 antenna; 15-joiuted, the basal joint testaceous, the second hisco-testaceous, the 

 thirteenth white, and the remainder nigro-fuscous. Pronotum quadrate, the 

 surface smooth, with a median depression and two straight divergent depres- 

 sions from the middle of the front margin, on either side of which the surface 

 is slightly tumid ; hinder third piceous, the rest nigro-fuscous, except the 

 margined sides which are luteous. Remainder of body piceous above, the 

 alxlonien with a castaneous tinge, feeljly punctate; beneath dirty pallid, poste- 

 riorly infuscated. Legs pale flavous, the femora clouded broadly with pale 

 fuscous in the middle, the tibise next the base. Sides of last alxlominal seg- 

 ment obscurely carinate. Forceps triquetral at base, straight to near the 

 slightly incurved, bluntly pointed tip, the inner edge distantly and feebly 

 granulate; viewed laterally they are feebly arcuate upward. 



Length of body, including forceps, 13 nun. ; forceps, 2.4 mm. ; antenna?, 

 5 mm. 



