376 Tachinidae. 



themia, but sometimes (in non Danish species) only three postsutural 

 dorsocentrals; two sternopleiiral bristles. Abdomen rather flat, short 

 ovate, or sometimes a little narrower and elongated ; all segments 

 with marginal bristles, third with two or foiir; sometimes also irregular 

 discai bristles present. Genitalia small and hidden. Hind tibiæ with 

 an anterodorsal fringe of medium long bristles. In some species hind 

 coxæ with small bristly hairs behind at apex and middle tibiæ with 

 ventral bristle, in other species both coxal hairs and ventral bristle 

 on middle tibiæ absent in both sexes. Claws and pulvilli elongated 

 in male. Wings as in Winthemia. 



The species are parasitic on many various Heterocera, one species 

 {cheloniae) also bred from Tenthredinids; guava and cheloniae belong 

 to Pantel's group 10, characterised by pedunculated eggs, and the 

 same no doubt holds good also for the other species. The eggs are 

 as a rule glued to the hairs of the host, but also sometimes fastened 

 on the skin. The larva in first stage lives free in the host, and later a 

 secondary breathing hole is formed. One to several parasites develop 

 in each host; they bore out just when the host larva is pupating 

 and pupate in the ground {gnava sometimes pupating in the host 

 pupa), or they pupate in the host pupa (cheloniae); the pupa hiber- 

 nates. 



Of the genus there are, after Villeneuve's revision in 1912, known 

 12 European species, but probably still more species, not yet recog- 

 nised, exist. The species form a natural group, but are very closely 

 related and difficult to discriminate ; there will thus be seen to be 

 great difference between the Kat. palåarkt. Dipt. and Villeneuve. 

 I have here naturally quite followed Villeneuve, and of all my species 

 I possess specimens determined by this author. Of the genus four 

 species have been found in Denmark. 



Table of Species. 



1. Hind coxæ witli small bristly hairs behind at apex; naiddle 



tibiæ with a ventral bristle 2. 



— Hind coxæ without bristly hairs behind; middle tibiæ with 



no ventral bristle 4. rutilla. 



2. Abdomen without discai bristles 1. gnava. 



— Abdomen with discai bristles 3. 



3. Frons somewhat narrow ; vibrissæ not ascending 2. cheloniae. 



— Frons broad, in male about as broad as the eye; vibrissæ 

 ascending to near middle 3. laxifrons. 



