52 Syrphidae, 



doubt about its specific distinctness against hicolor. I think, however, 

 the species may be distinct, as I find the described difference in the 

 shape of the hind margin of the fourth ventral segment in the male; 

 yet the difference is sh'ght, and it will have to be confirmed on a 

 richer material; otherwise I find no plastic characters; moreover I 

 have a female specimen which has a small, tringular, red spot at 

 the base of the second segment. 



P. alhifrons is a little more common here than bicolor; Amager, 

 Dyrehaven, Nordskoven at Jægerspris; on Langeland at Lohals; on 

 Funen at Odense; in Jutland in Højenbæk Dal at Vejle and at 

 Frijsenborg. One of the specimens has been bred, but no particulars 

 are given. My dates are ^Ve— ^/s. It occurs in the same way as the 

 preceding. 



Geographical distribution: — Europe down into Italy; towards the 

 north to southern Sweden, and in Finland. 



2. Triglyplius Loew. 



Species of somewhat small size and of black colour. Head about 

 semiglobular, a little broader than high and a little broader than 

 thorax, hoUowed behind. Eyes touching in the male, well separated 

 in the female, densely hairy; the facets in the male slightly enlarged 

 above. Frons not protruding, arched in the male. Antennæ inserted 

 a little below the middle; they are short, third joint roundish; arista 

 about of the length of 1he antennæ, inserted basally on the third joint, 

 and with quite small basal joints; it is bare. Epistoma not hoUowed 

 or produced, straight, slightly arched; it is black and hairy. Jowls 

 small, very slightly descending at the mouth edge, with a small pit 

 in front. Thorax rectangular or almost square; scutellum black, with 

 marginal hairs below. No thoracai or scutellar bristles; metapleura 

 with short hairs. Abdomen with nearly parallel sides in the male, 

 more ovate in the female; the two basal ventral segments weakly 

 chitinised. In the male there are four visible, not transformed seg- 

 ments above, the first small, the second and third long and of equal 

 length, the fourth or apical quite small; on the ventral side likewise 

 four segments, the fourth not quite small, its hind margin not reaching 

 to the end of the fourth dorsal segment. The genitalia constructed 

 as usual, not large. In the female abdomen likew^ise with four visible 

 segments, the fourth dorsal quite small so that the fourth ventral lies 

 under the posterior part of the third dorsal; the rest hidden, but 

 generally a pair of them may just be seen below ; the last terminates 

 with two relatively large lamellæ. Legs with the tibiæ slightly deformed, 



