32 PKOCEEDINGS OF THE ISTATIOISrAL MUSEUM vol.72 



In an oblique side view a silver' streak passes from the antennae to 

 the orbit bordered above and below by blackish streaks ; the antennae 

 and palpi are black, the facial depression is rather shallow and the 

 ridges have only four or five small bristles above the vibrissae. The 

 length of the head is the same at the antennae and at the vibrissae 

 (45 units), not including the epistoma which juts farther forward; 

 the height of the head is 55 units. The second antennal joint is 11 

 units long and the third 16. 



The thorax is very distinctly striped, the abdomen mostly shining 

 black with distinct median poUinose vittae; the apical third of the 

 fourth segment is orange red in color, more conspicuous at the 

 extreme tip beyond the small bristles. There are four sternopleurals 

 on one side, three on the other. 



Length, 10 mm. 



Not in the National Museum. 



109. BELVOSIA ESURIENS Fabricins 



Musca esuriens Fabeicixjs, Syst Antl., 1805, p. 301. 

 TacMna esuriens Wiedemann, Auss. Zweifl., vol. 2, 1830, p. 309, 

 WilUstonia esuriens Bbatjeb and Bergenstamm, Denk. Wien. Akad. Wiss., 

 vol. 56, 1889, p. 97 ; vol. 58, 1891, pp. 349, 403 ; vol. 60, 1893, pp. 123, 204. 



Two males from Brazil, both " Coll. Winthem." and bearing the 

 small, square red tag without writing, which Brauer says indicates 

 Wiedemann's original specimens. One is labeled "esuriens Wd. 

 (Fab.?)" on a very old label; the other has a B. B. label " WilUstonia 

 esuriens "Wd." 



Neither of these can be a Fabrician type, as the Winthem Collec- 

 tion contained none. The two specimens unfortunately are not of 

 the same species, and it becomes a serious question whether either 

 ca,n be regarded as an undoubted esuriens. Wiedemann apparently 

 saw the Fabrician type when he redescribed the species; his first 

 specimen mentioned above fits his own and the Fabrician description 

 better than the second, and in spite of the question mark I think it 

 must be regarded as the authentic specimen. It has the two whitish 

 abdominal crossbands as mentioned by Fabricius, and the one on the 

 third segment is obviously interrupted as mentioned by Wiedemann. 

 I therefore describe this specimen as the true esuriens^ since there are 

 probably no Fabrician specimens in existence. 



Male (Wiedemann erroneously calls it a female). Front at vertex 

 0.31 of head width; the eye rather broadly rounded above so that 

 the narrow part continues a little forward from the ocelli then 

 rapidly widening; parafrontal with three very irregular rows of 

 bristles inclined toward the center, the pollen gray becoming very 

 thin toward the vertex. Face and parafacials pure white, the latter 

 somewhat silvery; hairs below the lowest frontals black, in certain 



