423[Reprinted from lngecutor Inecitie Menrtruus, Vol. DL Nor. 7-9, 1921]

AN UNDESCRIBED WEST AFRICAN SPECIES OF
PTYCHOPTERA MEIGEN(Diptera, P tychopteride)
Bv CHARLES P. ALEXANDER
In a small collection of crane-flies from the Cameroun sent
to me for naming by Dr. Holland and Mr. Kahl of the Carnegie
Museum, there was included an undescribed species of. Ptychoptera. I am indebted to Dr. Holland and Mr. Kahl forthe privilege of studying their collections of West AfricanTipuloidea.
The three known Ethiopian species of. Ptychoptera maybe separated by the following key:
1. Mesonotumorange,unmarked(Natal-Eastern Transvaal),Alex.'
coy'ansds
Mesonotumblue-black.. . .... .. . a
2. Thoracicpleura.yellow; wings with the costalmargin and apex
dark brown; abdomenblack,the thiril and fourth tergiteswitl
narrow yellow rings (Nigeria), . .. .ofricatn Alex.oThoracic pleurabrownishblack with a restrictedyellowishwhitearea ventrad of the anterior spiracle; wings with the costal
marginand apexnot conspicuously
darkened;abdomenorange,tergites one to five ringed caudally with brownish black; ablack subterminalring; hypopygiumreddish brown (Cam..,..,..corrrerouretris,new specieseroun) .
'Ptytchoptera copensis Alex.; Ann. S. Afr. Mus., vol, 17, pp. 139140; 1917. Type in South African Museum.
'Ptychoptera africona Alex.; Entomologist, vol. 53, pp. 1O1-102; 1920.
Type iq British Museum.

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INSECUTOR INSCITI.dMENSTRUUS

qlmerounensis, new species.
General coloration blue-black; thoracic sternites and ventral
pleurites reddish yellow; wings grayish subhyaline; with twonarrow brown crossbands; abdomen orange with a subterminal
black ring; tergites one to five ringed caudally with brownish
black.
Male.-I.enrth, about 8 mm.; wing, 7.4 mm.
Mouthparts reddish testaceous; palpi obscure yellow, theterminal segments brown. Antennal flagellum black, the scapal
segments in the unique type injured. Head blue-black.
Thoracic notum blue.black. Dorsal pleurites brownish black,the ventral pleurites and sternites reddish yellow; a narrow
yellowish white area on the propleura between the anterior
spiracle and the fore coxa. Halteres dark brown, the base of
the stem reddish yellow. Legs with the coxa and trochantersreddish yellow; femora yellowish testaceous,darkened toward
the tip; tibia and tarsi dark brown. Wings grayish subhyaline, the costal region more brownish yellow; two narrowbrown crossbands, the first at the cord, extending to beyond
the fork of Cu; second crossband at the fork of R4+6, becoming indistinct at the fo,rk of M; veins dark brown; matrotrichie of wing extensive, passing into the distal ends of thebasal cells. Venation: Rs short, straight, a little shorter thanr-rn.
Abdomen orange, tergites one to five ringed caudally withbrownish black; a black subterminal ring; hypopygium reddish brown. Hypopygium with the lateral angles o{ the ninth
tergite digitiform, tapering caudally and ventrally into slenderhairy points; pleural appendages generally similar in shape
to the tergal lobes, elongate, cylindrical, slightly curved, thetips blackened, at the base on the inner face with a small toothHabitot.-Cameroun.
Holotype, male, Lolodorf, October 81,1918 (A. I. Good).
Type in the Carnegie Museum, Accession No. b264.
Ptychoptera