22 Orlliorrhapha biachycera. 



the discai vein, brownish, in the apical liaif yellowish; stigma light 

 yollow. just occupying the space between costa and the radial vein, 

 the cubilal vein forked at the apex. Halteres blackish brown, peduncle 

 a little paler. 



Female. Antennæ yellow, the annulated complex largcr than in 

 the male. Front moderately broad. not occupying one tliird of the 



Fig. 6. Wing of P. tarsalis. 



breadth of the head. shining black with a median longitudinal ridge; 

 two silvergrey spots above the antennæ. 



Lenght 3,5 — 4.5 mm. 



The larva is brownish or greyish brown with two more or less 

 indistincl, lighter, longitudinal lines on the dorsal and venlral surfaces. 

 these lines being more conspicuous in the pupæ; the length of the 

 larva is abt. 8 mm. 



P. tarsalis seems also ralher rare here, and it Iias only been 

 bred; Charlottenlund, Dyrehaven and on Lolland at Maribo (W. Schlick). 

 The larva was taken under bark and in decaying wood of beeches, 

 oaks and apple-trees; it was taken from the beginning of June to 

 the middle of July, and the imagines developed in the same months. 

 Jaennicke (Berl. Ent. Zeitschr. 1866, X, 220) refers it to have been 

 bred from beech {robustus Jaennicke = tarsalis Zctt.) 



Geographical distribution: — Northern and middle Europe, in north 

 to Southern Sweden and in south to middle Germany. 



Of the genus Pachygaster there is thus hitherto known two species 

 from Denmark. There is some reason to think that also P. atra Panz., 

 Leachii Curt. and perhaps also meromelas Duf. may be found, as they 

 occur both north and south of Denmark and also are found in Britain. 

 They will be easily distinguished from the two species described. P. 

 atra has the wings fumigated on the basal half, but the male has 

 black antennæ, and both sexes want the silvergrey spots above the 

 antennæ; P. Leachii has the wings cntirely hyaline and the legs quite 

 pale, only with a black ring at the tip of the hind femora; P. mero- 

 melas has the wings entirely hyaline but the femora are black. 



