Pachyophthalmus. I 237 



black triangular spots, the middle spots continued to a middle line; 

 second segment quite or almost qiiite black and fifth segment some- 

 times witlioiit distinct spots. Abdomen densely black-haired, without 

 bristles or only some indistinct and decumbent marginal ones, but 

 the marginal hairs on the three last segments longer than the others. 

 Legs quite black, front femora a little greyish pruinose. Wings nearly 

 hyaline; veins brownish. Squamulæ whitish. Halteres yellow. 



Female. Similar; frons of the same breadth; third antennal 

 joint shorter. Lateral spots on abdomen a little smaller. 



Length 4,5 — 5,5 mm. 



P. cylindrica is rare in Denmark; Hellebæk, Helsingør (Borries), 

 on Funen at Faaborg (C. S. Larsen) and in Jutland at Horsens 

 (O.G.Jensen) and at Hattenæs near Silkeborg (the author); the 

 dates are in July. The specimens from Helsingør are labelled as bred 

 from nests of Coelocrabro sp. Kramer 1. c. records it, like the preceding, 

 as bred from nests of C. cinxius in stalks of raspberry. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden and Lapland. 



38. Pacliyoplitlialinus B. B. 



Medium sized species of greyish or brownish grey colour with 

 dark spots on abdomen. Head broader than thorax, flat behind, 

 somewhat puffed out below, much higher than long. Frons in both 

 sexes somewhat narrow, about half as broad as the eye, a little pro- 

 truding; it has parallel margins, but the face is widening downwards 

 and thus inner eye-margin a little angular. Jowls narrow, somewhat 

 horizontal. In both sexes ocellar and inner and outer vertical bristles 

 present. Distinct postocellar and occipital bristles. Behind postocular 

 bristles black hairs. Frontal bristles reaching to lunula, above some 

 reclinate; outwards to the frontal bristles a row of hairs, some upper 

 of them strong, forming, as it were, orbital bristles. Cheeks with 

 some fme, sparse hairs above, for the rest bare. Vibrissæ ascending 

 to near middle, the vibrissal ridges converging below; a strong vi- 

 brissa present. Eyes with the facets towards inner margin in middle 

 a little enlarged. Epistoma a little retreating and only shghtly reflected 

 in lower part. Proboscis of medium length. Palpi thread-like. Antennæ 

 inserted below middle of the eye, short, third joint slightly longer 

 than second; arista very slightly pubescent, almost bare, second 



