Aphiochaeta. 267 



Female. Similar; abdomen with the fourth tergite abbreviated 

 as in ciliata, but generally a little less, about half as long as the third; 

 abdomen a little shining behind; hind femora as in the male with 

 longish hairs below the basal half. 



Length 1,5 to about 2 mm, after Schmitz to 2,88 mm. 



This interesting species stands between ciliata and aequalis, from 

 the former it is distinguished by the yellow balteres and the female 

 is at once distinguished from the aequalis female by the abbreviated 

 fourth abdominal tergite; also the male is easily distinguished from 

 aequalis by the colour of the hind legs, the length of costa and its 

 divisions, and the hairs below the hind femora. — I have compared 

 my species with typical specimens from Pater Schmitz. 



A. coaequalis seems to be rare in Denmark, I possess only seven 

 specimens, five males and two females; Ørholm (the author), Holte 

 (Th. Mortensen) and on Langeland at Lohals (the author) ; they were 

 taken from Ve— '7io in 1917 to 1920. 



Geographical distribution: — Besides in Denmark the species 

 occurs in Holland and also in Prussia (Schmitz, Tijdschr. v. Entom. 

 LXIV, 1921, 4). 



29. A. flavescens Wood. 



1908. Wood, Ent. Month. Mag. 2, XX, 26, 61 (Phora). - 1914. Brues, 

 Bull. Wisc. Nat. Hist. Soc. XII, 119. — 1919. Schmitz, Jaarb. Natuurh. Ge- 

 nootsch. Limburg 1918, 154. 



Male. Frons nearly quadratic, greyish black, dull; inner bristle 

 of lower row below the outer and about equally distant from it and 

 from the upper supraantennal; supraantennal bristles unequal, the 

 upper not large, the lower quite small and minute; the upper supra- 

 antennals about equally distant as the inner bristles of middle row or 

 a little more approximate, the small lower still more approximate. 

 Antennæ of medium size, yellow, third joint brownish at the apex 

 above, arista quite short-pubescent. Palpi yellow, of ordinary size 

 and armature. Thorax blackish, dull or nearly so, humeri and postalar 

 calli reddish, the pubescence brownish. Pleura brownish black, reddish 

 anteriorly. Mesopleura bristly, with one long and strong bristle. 

 Abdomen black, dull, the short hairs almost only visible at the sides; 

 at the sides of second segment tliere is a number of long bristles. 

 Hypopygium small; anal tube large and rather long, yellow. Legs 

 yellow, hind tibiæ and tarsi slightly darker; hind femora dilated, the 

 hairs below the basal half long, and the hairs on the anterior side of 



