HYMENOPTEROUS PARASITES OF RHYNCHOTA. 225 



more probably attacked Diptera. In America, Siphonophora 

 avence, Fabr-, is said by Howard (Ins. Life, 1890, p. 247) to be 

 destroyed by his Pachyneuron micans and Encyrtus ivebsteri ; 

 Ashmead has recorded (Bull. U.S. Nat. Mus. 1893, p. 110) 

 Lygocerus niger, How., from it ; and Dalla Torre gives (Cat. v. 

 535) L. triticum, Taylor, in the same capacity, on the authority 

 of Riley and Howard. Pachyneuron (Diplolepis) aphidis, Bouche, 

 given by him " Habitat in Aphidibus graminis " (Naturg. 170), 

 must be noticed here ; it was ascribed to Pteromalus by Nees, and 

 to its present genus by Bernhardt (Stett. Ent. Zeit. 1859, p. 192). 



45. Siphonophora chelidonii, Kalt. 

 Two species of the Aphidiine genus Praon are recorded from 

 this Aphid by Marshall; P. longicornis, Marsh., is represented 

 by a single male, raised by Bignell in Devon, as the latter tells 

 us, on Aug. 23rd, 1883 ; and the common and polyphagous 

 P. volucre, Hal., whose hyperparasites are Allotria ullrichi, Gir., 

 Isocrates (Asaphes) vidgaris, Walk., and an ined. or indeterm. 

 species of Lamprotatus, Westw. 



46. Siphonophora hieracii, Kalt. 

 Our only record of parasites upon this species is doubtful, 

 being based solely upon Curtis's mention (B. E. fol. 283) of Aphi- 

 dius picipes, Nees, bred from the Aphid of " Hieracium? ." 



47. Siphonophora millefolii, Fabr. 

 Bignell alone has brought forward (Trans. Devon. Ass. 1901, 

 p. 689) his breeding of Aphidius longicerce, Marsh., from Aphids 

 upon feverfew. This species often covers that plant in my garden 

 at Monks Soham, and I have never found another upon it. 



48. Siphonophora pisi, Kalt. 

 Two, probably three, species of direct parasite prey upon this 

 species. Aphidius silenes, Marsh., was bred thence by Bignell, in 

 Devon, on July 6th, 1883, and A. lonicerce, Marsh, emerged 

 from the same host upon the same day ; Haliday bred his A. ervi, 

 which is a very common species, "copiose" from Aphids on 

 Trifolium, probably the present species or Megoura vicice, Buck. 

 I have also received the first-named parasite from Mr. W. E. 

 Collinge, who bred six specimens from apterous females of this 

 Aphid at Birmingham in October, 1907. 



(To be continued.) 



