166 BRITISH APHIDES. 



next cell in succession, througli which they will even- 

 tually have to pass in effecting their exit by the top of 

 of the tube. Such is not, however, the case with 

 Cemonus and Stigmus, for generally their larvae are 

 disposed transversely in irregular sidings, from which 

 they escape through a general corridor of exit. 



Fassalcecus gracilis occasionally excavates the pith 

 of the bramble and also of the rose, and therein collects 

 black Aphides to feed its young. 



Passalcecus corniger, according to Giraud, also has a 

 similar economy. 



Diodontus minutus. — Westwood states that this insect 

 burrows only in sand, but, on the other hand, Sir 

 Sidney Saunders informs me "that he has obtained 

 apparently the same species also from briars, without, 

 however, discovering any clue to its pabulum, nor 

 does Shuckard advert thereto." The genus, however, 

 is cited by Giraud as Aphidivorous in its habits, which 

 accords with Kennedy's observation. Diodontus fristis 

 is also believed to be Aphidivorous. 



By the courtesy of Mr. Fred. Smith I am enabled 

 to fio'ure the last two insects from his collection. 



o 



Stigmus i^endulus. — Giraud found galleries excavated 

 by this insect, '' chargee de petits crottins agglutinnes," 

 amongst which he traced the dry remains of Aphides, 

 such as are found in the nests of Aphidivorous larvas. 

 He adds that Dahlborn places 8. pendulus amongst the 

 " Pemphredoniens aphidivores."* 



No faith can be given to the accounts which would 

 exceptionally comprise under the same category 

 Trijpo.riilon figulus and Mellinus arveiisis, which are 

 known to provide other food for their larvae. t 



* Giraud, p. 473. 



t Sliuckard, pp. 117, 205. 



