MrKi'in': kei'dkt on the snrTii gkorgia expedition. 93 
margin of abdominal segments, except the first dorsal with a narrow 
yellowish border; legs much more sparsely clothed with shorter hairs 
than in the male ; anterior and posterior tibiae and tarsi clothed with 
golden-yellow hairs as in the male but the metatarsi of anterior legs 
more elongate and narrower than in the male. 
Length, male 9 mm., female, 8.5 mm. 
Xo. i()45, Possession Bay, Sotitli (k-ort^ia, March 12, 
MM.v about t\vcntv-h\-e specimens found niosth untler stones. 
Ju(l,uin,i^- from the descrii)tion and li.i;ure this species is 
closely allied to .Icfoccics ahscoinUfa i^^nderlein' from the 
Frdkland Islands. It seems to differ from that species only 
in darker color and the uniform g-reyish-hyaline wing-s, the 
veins of \\hicli are without \-eIlo\vish-hro\vn border. It is pos- 
siljly only a race of . /. ahscDiulita. 
These Diptera, according to Air. Alur[)hv's field notes, 
were most commonly found under stones on the upper l)eaches, 
though he saw them also on sea-weed along the drift line, and 
crawling o\cr the rotting carcasses of seals. Thev were 
alwa\ s sltiggish, and he never >a\\ one tlw Sometimes when 
a stone was o\'erturned, hft}' or more of the ni])tera would be 
found httddled together, and if distiu'Iied tlie\ would scatter 
slowly, and walk deliberateh' to co\er. lie never saw them 
far aiiove sea le\-el, but commonly on the beaches and grass- 
grown moraines. 
Small dipterous maggots were seen on several occasions 
in the carcasses of birds which had lain dead on the beaches, 
which i^robably were the larva? of this species. 
Family I JI I'POHOSCI PJl 
PSEUDOLFKRSIA SPTNII^KRA Lcach. 
/■m.»m sthiifcm Leach, Epn)b. Ins. -^j. pi. XXVI. f. i-^. 
Oniilhomym umcolor Walk.. List IV.' '1144. 
Olfrrsiu sffiiiifcra Speiser, Zcitsch. f. Hvm. 11. Dipt., tl. 147. 
Olfi-rsia st>iiiifera Austen, Ann. and Mag. Nat. Hist. ser. 7. XII, _>65. 
Two specimens from Trinidad Islet, Sotith Atlantic 
Ocean, .April 8tli ( Xo. K);;,) and .\pril oth ( Xo. iwSS). The 
frigate bird taken at Trinidad on which llie\- are \erv likely 
parasitic was the sm;ill s])ecies I'l-c^^dUi arid. The following 
note on habit and ca|)lure is ironi Mr. .Mm-i)liv"s lield notes: 
'AMiile fishine near the rocks of Trinidad Islet ntmibers of 
