Diptera Xematocera from Si^itshergen. 200 



included iu botli genera. Kiefifer lias himself shown, how- 

 ever, tliat the pulvilli vary in size in the different species, 

 and has recently erected the genus Acricotopns to include 

 the iuterniediate species with very small pulvilli. I consider 

 that van der AVnlp's orijiinal conception of the genus was 

 both simpler and more natural, and i)ropose to include in 

 Cricotopiis all hairy-eyed Orthociadiariae which liave more 

 or less distinctly Mhite-winged tihije and wliitish genital 

 organs (at least in the female). In taking tliis conrse I am 

 following Goetghebuer, but I would also go further and 

 transfer the few dark-legged species which pcjssess pulvilli 

 (these also have dark genital organs) to Trichocladius. 



Cricoto/ius gluciidis, s[). u. 



SprrsuEKGEN : Hruee City, head • of Klaas Billen Bay, 

 22. vii.-14. viii. 1921 ; on hut-window, on shingly raised 

 beach (some taken ovipositing on pond), and on flowers of 

 Dn/as octopetala and Saxifrciga hircuhis ; 40 (J, 52 ? . 



N. Edixbukgh Island (S.W. of Prince Charles' Foreland) : 

 on stones of rocky beach just above high tide, 29. vi. 1921 ; 

 3 c?,6 ?. 



Head dark brown, more yellowish below the antenna?. 

 Antennse and month-parts entirely blackish (cJ ? ). Palpi 

 normal. Terminal flagellar segment of ^ not quite twice as 

 long as the remaining flagellar segments together, penulti- 

 mate segment about as long as broad. Second antennal 

 segment of ? distinctly constricted in the middle, seg- 

 ments 3-5 oval, segment 6 pointed, twice as long as 

 segment 5, with rather numerous short sense-bristles, but 

 no verticil. Thorax of J blackish, except for the shoulders 

 and the pleuial sutures; of ? yellow, three well-separated 

 mesonotal l)ands, postnotum, mesosternum, and part of 

 pleurre Ijlackish, scutellum somewhat darkened. Abdomen 

 of (5" entirely blackish brown, including the first segment; 

 tergites with narrow shining apical bands, remainder of 

 surface almost dull. Hypopygium daik brown on the basal 

 half, whitish on the apical half; structure as figured (fig. 8). 

 Abdomen of ? dark brown dorsally, yelloAvish ventrally, 

 especially towards base; lamellaj whitish yellow. Legs 

 blackish brown, femora yellowish at the extreme base only ; 

 tibife with ill-defined whitish rings, more distinct on the 

 posterior legs than on the front pair, and generally much 

 more distinct in the ? than in the $ , in the J the front 

 tibitC often entirely dark ; on the middle tibiie the jrale ring 

 occupies about half and on the hind tibiie about two-thirds 



Ann. cC- Mag. N. Hist. Ser. 0. Vol. x. U 



