NOTES ON THE ETHIOPIAN FRUJT- FLIES — I. 241 



10. Trirhithrum nigerrimum, var. coffeae, var. nov.* 



Very near the preceding form, but even smaller and distinguished by the 

 characters given in the table. 



cJ $. Length of body, 2 '8-3 mm. ; of wing, 3 mm. 



Head, thorax and abdomen as in the preceding variety ; but the vertex and the 

 abbreviated lateral stripes of the frons, which are opaque in that form, are in the 

 present distinctly shining. The tibiae are black, with the tip only narrowly pale 

 yellowish. There are some important differences in the wing pattern : (1) The 

 stigma is less infnscated, and before it there is a small black dot on the upper end 

 of the 2nd costal cell ; (2) the marginal band is much narrower and very sinuous, 

 because the four hyaline spots of fore border are broader and the two tooth-like 

 projections are more pronounced ; (3) the hyaline space between the marginal and 

 the cubital band is not acute at the base, but ends exactly on the small cross- vein, 

 being there truncated obtusely ; therefore the cubital band is differently shaped at 

 the base ; (4) there is a broad hyaline spot at the base of the 3rd posterior cell, in 

 front of the anal cross- vein. 



Type $ and type $ (British Museum), a single pair of specimens from Gold 

 Coast, Aburi, December 1910 (L. Armstrong), bred from coffee berries. 



It is curious that Prof. Silvestri at the same locality (Aburi) in January 1913 bred 

 from coffee fruits the form above recorded as nigerrimum, which differs from the 

 present one in the colour of the face and wing pattern. These variations may be 

 only individual, or they may depend on the breeding conditions, or even only on 

 the state of preservation of the specimens. 



Ceratitis albomaculata. v. Roder (Berl. Ent. Zeits., xxix, 1885, p. 136), from 

 Delagoa Bay, is doubtfully referable to the present genus, but has a similar wing 

 pattern, with basal streaks and no middle band or tooth ; it is said however to have 

 the anal cross- vein not deeply sinuous, and is therefore perhaps to be excluded from 

 the allies of Ceratitis. 



IX. Xanthorrhachista, Hendel, 1914. 



I will give here an account of the characters of this very peculiar genus, which 

 was recently erected in a few words only by Prof. Hendel."f 



Body .4c^m-like, but more elongate, shining testaceous, with small black dots 

 on the thorax and scutellum. Head in front view distinctly higher than broad, but 

 in profile subquadrate, being much swollen below on account of the very developed 

 lower occipital swellings ; cheeks narrow ; jowls broad. The position of the head is 

 very peculiar, the neck being inserted very low, so that the head is raised considerably 

 above the front border of the thorax (" Kopf balancierend " of Prof. Hendel). Eyes 

 twice as high as broad, but not much narrowed. Antennae inserted a little above 

 the middle of the eyes, with the third joint rounded at tip and extended a little 

 beyond the middle of the face ; arista shortly plumose, the breadth of the feathering 

 being less than the breadth of the 3rd antennal joint. Face with a distinct middle 

 keel in the upper half, flattened below and slightly prominent at the mouth-border. 

 Palpi broad and spathulate, with short bristles ; proboscis short and thick. 



* [As mentioned above (p. 235) this form is identical with T. inscriptum, Graham 

 (1910).— Ed.] 



f Wien. Ent. Zeit., xxxiii, April 1914, p. 81. 

 (0419) d 



