62 Fritz Johansen and I. C. Nielsen. 



clothed with long, black hairs; only on the second segment on and 

 around the spots, there are paler to yellow hairs. The legs are 

 chiefly black, the knees broadly reddish yellow, which colour extends 

 more or less on the tibiæ, and the tibiæ may be quite reddish with 

 a more or less distinct black ring about the middle; the hairs on 

 the legs are black. The wings are hyaline, very slightly yellowish, 

 with brown veins; the halters are yellowish. Length 8 — 10 mm. 



There are four specimens of this species, all males; they are 

 quite alike, only varying a little with regard to the presence or 

 absence of the first pair of spots and lighter or darker legs. The 

 species is evidently allied to the known Catabomba species, it is 

 very characteristic by its extraordinarily low and broad face. '/7 07, 

 four specimens. 



12. Peteina sty lata B. & B.^ 



A full-grown larva of üasychira groenlandica, which was caught 

 on June 22 1907, bore 6 eggs of this parasitic fly on the side and 

 underside of the thoracic joints. The parasitic larvae had not yet 

 penetrated into the host. 



A full-grown larva, also collected in June, was put aside for 

 rearing, and as it was found dead in the beginning of July it was 

 subjected to closer examination, which showed that it contained 3 

 scarcely full-grown, dead larvae of the parasitic fly. On this host- 

 larva the eggs of the parasitic fly were found in a furrow on the 

 thorax; the parasites had bored their way in through the skin and 

 lay pressed close up against each other, in very distinct sacks of the 

 fatty body; and their hind parts were attached to the skin of the 

 host by means of a chitinous funnel. The digestive canal of the host 

 was still untouched and the fatty body still not wholly consumed. 



Lastly, a single parasitic larva bored its way out of a Dasychira 

 larva on the 6th of July and pupated. 



The eggs are ahuost 1 mm. long, white and without sculpture 

 on the shell. 



The larva in the 3rd stage. The length of tbe specimens examined, 

 which were a little contracted, varied from 9 — 11 mm. 



The spinous armature is found on the anterior margins of the 



> The species was not reared so tliat the determination is not quite certain. I 

 lielieve, however, tliat onl}^ Peteina stglata can be in question, as in addition 

 to this species onh' two other parasitic flies occur in Greenland, namel}', Tachina 

 larvarnm L. and Echinomyia aenea Stæg. The larvae of the first-named species 

 are known (I. C. Nielsen: Iagttagelser over entoparasitiske Muscidelai'ver hos 

 Arthropoder. Kbhvn. 1909, p. (50) and are different from the above described 

 larvæ; the Echinomyiae are viviparous and the pupae are too small to belong 

 to E. aenea. Further, Peteina stijlata was earlier reared from the larvæ of Dasy- 

 chira groenlandica (cf. I. С Nielsen: The insects of East Greenland, p. 394). 



