358 PERCY SLADEN TRUST EXPEDITION 
Note. This form has many Drosophilid-like characters. 
Type. The following species. 
54. Amygdalops thomasseti, n. sp. (Fig. 89 and Plate 21, figs. 48, 49, 50, 51). 
The cheetotaxy is as given in the generic description ; the present species has a fine 
row of bristles extending from the d. c., the first (in front of d. ¢.) being somewhat longer 
than the rest: the acrostichals form four well-defined rows in front, less well defined 
behind, the mid-rows diverge at base of thorax. Other small bristles (like the acrosti- 
chals) are on the general surface of the dorsum. The following details refer to colour 
characters principally. 
Head. Vertex and frons shining orange, with a long darkened triangle from the 
vertex to about the mid-frons. The base of this vertical triangle is about half the distance 
between eyes in middle of frons: forwardly it is bounded by fine darker lines which 
do not meet. Hye-margins very broad, orange, silvery especially towards front. Hind 
head hollowed and darkened orange. Face orange with narrow silvery eye-margins 
broadening out sideways into the broadish somewhat silvery-orange jowls. Antennze 
orange, arista a little darker: upper hairs are, dorsally five or six very long ones on basal 
half, three or four shorter ones beyond; below some four fine hairs, and a very evident 
inner row; palpi and tongue yellow with a few hairs. 
Thorax. Dullish dark brown, two narrow orange stripes from the neck to the cross 
suture. A pale side stripe from right over humeri along line of bristles and base of wing 
to the entirely yellow halters. Below this a sharply defined parallel brown stripe from 
the neck to the abdominal insertion. All the rest of the thorax below the pale yellow is 
orange. The rounded arched seutellum dark brown. Wings, as Fig. 39, suffused from 
just before whole length of third vein to just beyond fourth and fifth veins: this 
darkening is very strong (almost forming a terminal spot) from just before where the second 
vein ends to the tip of wing: rest of wing pale, veins brown on the dark part, yellow on 
the uncoloured part. Legs entirely palish yellow. Front femora with two roughly 
complete rows of fine long bristles, one row inside, one out, both pointing downwards and 
outwards. Mid-tibia with terminal spine: the fine ciliation below front and hind first 
tarsal joints form two fairly conspicuous clumps just at beginning of these joints. 
Abdomen. Dark brown on top and sides, yellow below. Sub-marginal bristles 
small: a few others scattered on the dorsum. The male hypopygium is in the form of a 
small hemispherical knob below the last segment. 
Size, 2°1 mm.; wing, under 2 mm. 
Localities. Seychelles. Silhouette; Mare aux Cochons, IX. 1908. Mahé: near 
Morne Blane, X.—XI. 1908; marshes on coastal plain, Anse aux Pins and Anse Royale, 
I. 1909. Praslin: Cétes d’Or Estate, XI. 1908. 
