20 Orthorrhapha bracbyceia. 



The larvæ (P. farsalis) are elongated. slightly flattened, the body 



consists of twelve segments in all. The head is rather long. conical 



and somewhat pointed ; on each side of the head. nearest lo tlie base, 



there is a distinct eye-spot. Brauer says: „Augen fehlend (y)", but 



in P. tarsalis they are distinct. Tlie segments are broader than long. 



with the exception of the last, which is subquadrate. rounded behind, 



and on the ventral side it bears the anus as a longitudinal split. Each 



segment has on the sides a little knob-like dilatation and bears 



a girdle of strong bristles, consisting of four on the dorsal 



surface, six on the ventral surface, and one on each lateral 



dilatation, besides somo smaller bristles. The bristles on 



the dorsal surface are longer than those on the ventral 



surface, those on the lateral dilatations are the longest. 



On the hind margin of the last segment there are eight 



- , long bristles. On the prothoracic segment there is a 



; "^ spiracle on each side, and on the last segment, above, near 



' ■^ the apex, there is a small, horizontal split with terminal 



. , spiracles; on the other segments I could not detect 



of F. tarsalis. spiracles, if they are there, they must be very small and 



X 4. inconspicuous. 



The larvæ live under the bark of trees or in decaying 

 wood ; they certainly iiibernate, and the transformation and develope- 

 ment take place in summer. 



The species of Pachygaster seem generally to be somewhat rare, 



perhaps chiefly on account of their small size. According to Schiner 



they are lively and merry and swarni in low herbage and around bushes. 



Of the genus 5 (or 6) species belong to the palæarctic region, of 



these 2 have hitherto been found in Denmark. 



Tdblf of Species. 



1. Wings quite hyaline, cubital veiii nol forked. no silver 



grey spot above the antennæ 1. minutissima. 



— Wings with the basal part slightly fumigated, cubital 

 vein forked, front with silver grey spots above the an- 

 tennæ 2. tarsalis. 



1. P. minutissima Zetl. 



1840. Zett. Ins. Lapp. 575, 1, nota. — 1842. Zelt. Dipt. Scand. 1, 153, 4, 

 et 1849. VIII, 2961. 4, et 1852. XI, 4261, 4. - 1870. Loew, Zeitschr. 

 gesamml. Naturwiss. XXXV, 269, 1. — 1903. Kat. palåaikt. Dipt. II, 2. 



Male. Antennæ brownish black. Thorax black, shining, very 

 finely and inconspicuously punctate and clothed with extremely short 

 and inconspicuous pubescence. Abdomen quite glabrous and therefore 



