H. C. EFFLATOUN. 



varions Compositae, where they form fairh' large and conspicuous 

 galls. The Sicilian E. megacephala Lw. is known to be ^alligenous 

 on Invla crithmoides. E.iphionae, Efflat, is als> Avoli known hère 

 to form large galls in the composite plant, Iphiona mucronata,aspe- 

 cies closely allied to the host plant of the Europer.n s})ocies. It is 

 quite possible therefore that many other speeies will bo fourni to 

 belong to a natural genus which is biologically characterised by the 

 faculty of prodvicing galls or pleurocecidia on Comi)fy</t(.'e, a charac- 

 ter quite uncommon in the group of flower-head flies. 



The gall of Iphiona mucronata (Forskal) formed by the larva of 

 E. ijihionae Efflat. is an ovoid or fusiform swelling, measuring up 

 to 8 mm. in diameter and 8 to 15 mm. in length Those situated in 

 the centre of the large branches are fusiform, but tlie ones oocu})ying 

 the whole of the surface of the smaller branches are ovoid and trun- 

 ca'ted above; the central cavity of the gall is larg.3 with a wall 

 1.5 mm. thick. The adult escapes by nicaiis of a bole which it per- 

 forâtes at the side. 



EUARESTA IPHIONAI' Eff.at. 

 (PI. V fig. 8 and PI. I fig^ 1 and 21) 



Efflat., Bidl. Soc. Roy. Entom. dT.oypie, 153. (1923). 



DIA GNOSIS: — A beautif ul bright green speeies when alive ; 

 greenish-grey when dry; easily distinguished by the pattern of the 

 wings, which bave their basai third hyaline, and the black colour 

 radiating at the apex. 



Maie and Female. Length of body : 2.9—3.!) mm. ; ovipositor : 

 0.8 mm.; wing : 2 7—3.4 mm. 



DESCRIPTION:— Head very broad, a little broader than the 

 thorax, entirely yellow and covered with a cinereous pulverulence; 

 frons broad and very flat; the lunula well developed and fairly pro- 

 minent; face a little shoi'ter than the frons, concave in the middle 

 and with a rather Dromiuent epistoma; cheeks rather broad; occiput 

 concave on its upper half and with a more or less distinct, double, 

 blackish spot in the middle; ocelli blackish but the triangle is yellow- 

 i.sh-grey; eyes rounded; antennae very short, being much shorter 

 than the face and entirely yellowish; second joint prominent above 

 and bearing some minute black bristles; third joint shorter than the 

 two basai joints together, with the ui)per margin a little concave 

 and the terminal angle not pointed; arista bare, yellowish and 

 thickened at the base, but blackish for more than its apical half; 

 proboscis thick, reddish-yellow; palpi very small much shorter than 



