Dipiera: Ncmocera rera, N. anomala and Ereniochaeta . 461 



paper (The devel. of the head of the imago of Chironoinus p. 269, 

 Tab. XXIX, fig. 14, c) I find the saine Observation: „On the vertex, 

 and between the posterior angles of the ej'es, are seen a pair of mi- 

 nute tegumentarv processes, probably of little, if any. functional sig- 

 nificance. We find, however, that in the pupa they are connected 

 with the brain by a Single median nerve. It may be of interest in 

 this conuection to recall a Statement of Dufour (Rech. Anat. sur les 

 Dipt. p. 178; 1851) that in Tipula oleracea, an insect belonging to 

 a genus characterized by Meigen, Macquart etc. as devoid of ocelli, 

 he found at the posterior border of each Compound eye a minute 

 ocellary nerve terminated by a sabglobular violet-coloured retina. 

 He further found behind the insertion of each antenna a minute sub- 

 hemispherical tegumentary prominence. Although failing to trace with 

 certainty the connection between the nervous and tegumentary struc- 

 tures so described, he hazards the conjecture that they are really 

 associated, and regards them as the functionless vestigiary represen- 

 tatives of the ocelli of other Dipterous genera." 



In my Monograph of the N.-American Tipulidae (Monogr. of 

 N. A. Dipt. IV, p. 234; 1869) I have mentioned that in that family 

 the gonus Trichocera alone has distinct ocelli on each side of a 

 gibbosity immediately behind the antennae. I thought at that tirae 

 that I could also see something like it in the genus Pedicia. 



p. 441. Campylomyza sucking a Caterpillar. J. Gr. Apetz in 

 the Stett. Ent. Z. 1849, p. 62 records an Observation of a Campylo- 

 myza, apparently sucking a Caterpillar of Smerinthus ocellatus. 

 I am not aware of another Observation of this kind, although cater- 

 pillars are sucked by Culex and Sim,ulhim. 



p. 442. Dixa. While reflecting about the location of Dixa in 

 the System and searching the literature in the hope of discovering 

 some ray of light about it, I happened to find a passage in West- 

 wood (II, p. 515) which I had overlooked before: „these pupae" (of 

 Chironomidae) „offer a marked difference from those of the true 

 incomplete pupae, their legs, from their great lengtli, being partially 

 convoluted, and forming, with the wings and thorax, an uniform mass, 

 the limbs being less distinct even than in the obtected pupae of the 

 Lepidoptera." This gave me the clue that I wanted. In the work 

 of Meinert (De P]uc. Mygg.) I compared the figures of the pupae of 

 the Chironomidae and Culicidae (Culex Tab. I, f. 11, Anopheles I, 

 3Ü, Corethra II, 54, Morhlonyx III, 74, Chiron otmts III, 84, 88, 91, 

 Tanypus III, 97, 101), and found that all these pupae have the 

 structure described by West wo od. Those of the genus OAironom«« 



