TABANUS. 55 



The ill-defined colour of the body of this species is somewhat difficult to describe. 

 Thorax of a pale reddish-brown above, almost imperceptibly whitish-pruinose anteriorly ; 

 ill-defined paler reddish spots sometimes mark the divisions of the usual stripes ; ante- 

 alar callus pale-coloured, almost whitish ; traces of greenish on the post-alar callus and 

 on the scutellum ; a tuft of yellow hairs on the post-alar callus. Pleurae yellowish, with 

 reddish-yellow hairs ; in one specimen very pale, almost whitish-yellow, with pale 

 yellowish-white hairs. Abdomen of a dirty brownish-yellow, with an admixture of 

 more or less greenish, especially towards the base ; a delicate, scarce, appressed black 

 pubescence, which becomes more dense and distinct and forms a fringe on the posterior 

 margins of segments 4-6 ; in the middle of these margins there is sometimes a spot of 

 whitish hairs, often wanting ; lateral margins, beginning with the third segment, with 

 tufts of pale yellow hairs ; venter yellowish-brown ; posterior margins of the segments 

 yellowish. Face and cheeks pale yellowish, with reddish-yellow hair, or, in some spe- 

 cimens almost whitish, with whitish hair ; palpi in one specimen reddish-yellow, with 

 golden-yellow pile, in the other yellowish, with black pile. Antennae : third joint rufous, 

 deeply excised, the long upper branch linear, blunt at the tip, and reaching beyond the 

 base of the annulate portion of the joint : basal joints a little paler, more or less beset with 

 black pile. The front is almost entirely occupied by a chestnut-brown, smooth, shining, 

 slightly raised stripe, which absorbs the usual frontal callus, and reaches upwards nearly 

 to the vertex ; the interval between this stripe and the eye is pale-yellowish pollinose ; 

 vertex brown, whitish-pruinose, with some black pile. Halteres pale yellow. Wings 

 subhyaline, more or less tinged with pale brownish ; costal cell and stigma brownish- 

 yellow; first posterior cell broadly open, the fork without stump of a vein. Two 

 females. 



Although the two specimens show the above-described differences in the colour &c. of 

 the pleurae and palpi, I entertain no doubt about their specific identity. 



The eyes (revived on wet sand) are of a handsome reddish-purple, with green 

 reflections. 



11. Tabanus albonotatus. 



Tabanus albo-notatus , Bellardi, Saggio &c. i. p. 56, t. 2. f. 5 ( ? )\ 

 Tabanus oculus, Walker, List &c. i. p. 157 ( $ ) 2 . 

 Tabanus bipartitus, Walker, List &c. i. p. 158 ( <j> ) 3 . 



Hab. Mexico {Salle *), Tampico (de Saussure l ) ; British Hondukas, E. Sarstoon ; 

 Honduras 23 . — South Amekica, Colombia 2 . 



The characteristic black spot (surrounded by a whitish aureole) on the scutellum, the 

 appendiculated branch of the third vein, the closed first posterior cell, and the colour of 

 the front tibiae (dark on the distal half) renders the identification certain. The frontal 

 callus, in my specimens, is chestnut-brown, not black ; the hind margins of the abdo- 

 minal segments show traces of white hairs in the middle ; the brownish clouds on the 



