Nematocerous Diptera of Jan Maijen Island, 239 



inesonotal stripes in 0, pleuralin), the eiiipodia of these 

 females seem rather longer. 



10. Cricotopus hasalis (Staeg.). 



A series was colleGted by Mr..Biistowe, including several 

 o£ both sexes. This forms an interesting extension of the 

 known range of this widely-spread circumpolar species. 



" Plentiful round the North Lagoon (a deep freshwater 

 lagoon).^' (^Bristoice.) 



11. Camptocladius incertus (Becher). 



The seven females of this species in Becher's collection 

 are all more or less damaged and very much faded through 

 long immersion in alcohol, but are still recognizable. They 

 appear to be identical with Kieffer's Trichocladius (^Phoino- 

 cladius) curvinervis. Becher's figure of the wing hardly 

 suggests a Camptocladius j but it is inaccurate, the bend in 

 Cu2 being really quite pronounced in all the specimens. The 

 halteres are yellowish, as described by Kieffer; in recording 

 the species recently from Spitsbergeri, I omitted to notice 

 that the halteres in those specimens were dark, though, since 

 they agreed in other respects, the identification may be correct. 

 Camptocladius incertus, Luudstrom, recently described from 

 Arctic Siberia, is possibly the same species. 



12. Camptocladius ? lasiop}hthalmus, Msd\. 



Several specimens (including both sexes) collected by 

 Mr. Bristowe resemble C. incertus in most respects, and are, 

 perhaps, referable to that species, but the fork of Cu is 

 shorter, its base being quite twice the length of the cross- 

 vein distant from the base of the cross- vein. These specimens 

 agree in all respects with Malloch^s description of C. lasio- 

 pkthalmus, and differ chiefly from the common European 

 C, aterrimiis, Mg., in having paler halteres. The males 

 agree with C. nudipennis, Goet., as regards antennae and 

 hypo})ygium, but have the eyes distinctly though very 

 shortly pubescent. 



"" Camptocladius lasiophthahnus was very common on 

 flowers, especially the dandelion. Taraxacum officinalis (Web), 

 and Saxlfraga ccespitosa (L.) up to 2000 it. The latter 

 seemed to be very sticky inside, and dead specimens were 

 frequent, having apparently been caught by the gummy 

 nature of the flower. Whether the Saxifrage benefited in 

 any way by their dead bodies, I do not know. Two 



