.1 Monograph oj Egyplian Diptcra. 45 



4. LAsionniiicijS UOJM). 



Rond., Nuov. Annal. Sri. Nal. H(.l(.i;iia, (:!). H. 4r;9. XXXF., 

 {Ln,\oi.thU-„x) {\>i\\) et Annal. Air. As|). Nal. Nap., Jll. 157. 

 {Ldsiophlicus) (184()). 



S) SOWM): -(''il<(''i>iiil><i OsT.-S.vcK.. We.s'. I)ii»l , IJnlI. 

 Geolng. 8nrvcv, 111. N ■ 2. ;i2ô. (1.S77) it C'atal. N.A. Dipl., (><l. ji. 

 244. (1S96); Willist., Svn. N.A. Svrph., (52.(1. S8G); MiK, Wioii.Eiit. 

 /oit'4., 1. 154., VU. 222. (ISSs); Vkui!., WvW. l'I., VU. :«:i., Cat. 

 Syrph., 55. (1901). 



This gemis is dislinguisilicd t'idiii Ihc (li^niis Si/r/^/nis hy llic 

 vTiy nuicli inHatcd Irons in liotli soxcs, owing tn wliicli llii' spacj 

 hetween the eyes diminishcs fimii the fions to the inoutli ; in tlie 

 niale there is also an arca of large facet,s nu tlie npiKT an;l niiddle 

 portion of the eyc. 



The nietam()rpho.scsor nicinbiM-s ol this genus havaheen kuown 

 sinee 17CU when Linn?cns speaks ol' the larva of .Musni /n/rnsfn 

 found fecding auiong Aphids on Pyrus. Lundheck also statcs that 

 the same larva is mentioned by Réanniur (1737) as cîecnrring on 

 Sambiicus and Lonicera; by De Gecr (1776) on Rosa [Musca rosœ); 

 by Meigen (1822) on Sonchus ulririm/s: by Vallot (1834) on Can- 

 nabis; by Curtis (1857) on Brassini nlmicea on the shore in July ; 

 and by Schiner (1857) froni Carduus. Verrall also states that the 

 samo species was bred from Rosa, and froni larvae fesding on 

 A2)his brussicœ and pruni, and on an Aphis from Centdurcd . 



Lundbeck gives the foUowing description of the larva of I.. 

 ■py mstri : "it is not much flattened, tapering towards the anterior 

 end and with strong mouth hooks; it is strongly transversely cor- 

 rugated, and the dermis is shagreened from densely placed small 

 spines; on the ventral side there are seven transverse swellings, 

 each belonging to a segment ; the swellings are divided into some 

 warts somewhat similar to prolegs. On the dorsal side there are 

 some longer hairs or spines, placed, distantly in transverse rows 

 on some of the corrugations, and similar ones are found along the 

 sides; they are regidarly placed quite in the same way as described 

 for Platychirus viz. on the second to seventh abdominal segments, 

 two on one corrugation in the middle, and on the following cor- 

 rugation two on each side, besides the three latéral ones longer 



