Rhacodineura. 399 



88. Rliacodlneupa Rond. 



Species of medium size, all greyish yellow pruinose. Head a 

 little broader than thorax, a little convex behind and puffed out 

 below, higher than long. Frons broad and equal in both sexes, slightly 

 protruding; jowls to half as broad as the height of the eye. In both 

 sexes ocellar, inner and outer vertical and two orbital bristles. Post- 

 ocellar and occipital bristles relatively strong. Occiput with nearly 

 all black hairs. Frontal bristles descending to insertion of arista, 

 about two upper reclinate in both sexes; the rows bending outwards 

 to the eye-margin below. Cheeks bare. Vibrissæ ascending to the 

 middle. Eyes bare. Epistoma retreating, rather deeply impressed 

 and thus strongly concave, but not reflected below. Proboscis and 

 oral cone short. Antennæ inserted high above middle of the eye, 

 second joint short, third about five to six times as long in male, in 

 female shorter; arista with second joint short. Thorax rectangular; 

 three postsutural dorsocentrals and three præ- and three postsutural 

 acrostichals; a præsutural intraalar bristle. Scutellum with four 

 marginal bristles on each side, the apical small, about parallel; a 

 pair of discai bristles. Three sternopleural bristles. Pteropleura 

 with few hairs and a bristle above. Abdomen ovate, excavation on 

 second segment small, but reaching hind margin; there are discai 

 and marginal bristles, on second segment a pair of marginal; fifth 

 segment in male as long as fourth, cut behind, in female shorter, 

 pointed. Genitalia small, hidden. Legs with anterodorsal bristles 

 on hind tibiæ unequal; claws and pulvilli small in both sexes; front 

 tarsi in female simple. Wings with the apical cross-vein generally 

 wanting or rudimentary (antiqua), when present the angle obtuse 

 and first posterior cell nearly closed, ending quite near apex of wing; 

 bristles at base of cubital vein somewhat strong; a medium long 

 costal spine. 



The species is parasitic on various Heterocera, antiqua also on 

 species of Forficula', they belong (antiqua) to Pantel's group 2. 



Of the genus three European species are recorded, one occurs in 

 Denmark. 



1. R. antiqua Meig. 



1824. Meig. Syst. Beschr. IV, 412, 300 (Tachina) et 1838. VII, 253, 1, 

 Tab. LXXII, Fig. 6—10 {Roeselia). — 1844. Zett. Dipt. Scand. III, 1056, 50 

 et 1855. XII, 4694, 50 {Tachina). — 1862. Schin. F. A. I, 516 {Roeselia). — 



