92 DIPTEEA. 



Head and thorax very much like H. pilatei, but the rufous colour more prevalent ; 

 the collar-like fringe of rufous hair on the anterior part of the thorax is more red, and 

 is not hedged in by a fringe of black hair posteriorly ; the black hairs on the humeri 

 and in front of the anterior coxae are less apparent. Antennal style equal to at least 

 two thirds of the third joint. The brown surface of the thorax shows a pair of darker 

 stripes ; the reddish-brown minute semi-erect hairs covering it are rather dense, and the 

 black erect pubescence short and inconspicuous. The white stripe on the second segment 

 is broader than in H. pilatei, and occupies nearly the whole segment, except its hind 

 margin, which bears a fringe of black hair ; on the three or four last segments white 

 scales predominate ; the surface of the abdomen, beginning with the third segment, is 

 covered with semi-erect black pile, which is shorter and much less conspicuous than in 

 H. pilatei ; the sides of the abdomen show rufous tufts at the base ; white tufts on the 

 second segment, and a black fringe, mixed with some white and reddish hairs, on the 

 following segments. Venter pale brownish-red, clothed with pale red and whitish hairs. 

 Legs reddish-brown, with red scales and black bristles ; tarsi darker. Wings hyaline, 

 spotted with brown ; basal portion brown, which colour reaches a little beyond an ideal 

 line connecting the humeral cross-vein with the axillary excision ; a brown spot at the 

 origin of the second vein, and usually another one at the proximal end of the discal cell ; 

 a cross-band beginning in the distal end of the anal cell reaches across the discal cell 

 to the first vein, where it coalesces with the brown of the costal cells ; a second cross- 

 band occupies the middle of the marginal cell, the distal end of the first submarginal 

 cell, and the proximal ends of the second and third submarginal cells, and coalesces 

 more or less with a brown spot of variable size at the end of the first posterior cell ; 

 there is a brown dot at the tip of the second vein, and another one at the tip of the 

 vein between the second and third posterior cells ; second costal cell (that is, the 

 interval between the humeral cross-vein, the costa, and the auxiliary vein) subhyaline ; 

 third costal cell (interval between the auxiliary and the first veins) infuscated. 



I had for comparison three specimens from the collection of Prof. Bellardi, and one 

 from Tres Marias Islands. 



4. Hyperalonia proserpina. 



Anthrax proserpina, Wiedem. Aussereur. zweifl. Ins. i. p. 257. 



Exoprosopa proserpina, Schiner, Reise d. Novara, Zool. iii. Abth. i. p. 117; Arribalzaga, El Natu- 



ralista Argentmo, i. p. 266; Van der Wulp, Tijdschr. &c. xxiv. p. 165, t. 15. f. 12 \ 

 Anthrax hlugii, Wiedem. Aussereur. zweifl. Ins. ii. p. 632 (teste Schiner). 

 Anthrax rufescens, Walker, List &c. iii. p. 238 (sine patria) . 



Hob. Guatemala, San Geronimo, El Eeposo (Champion); Costa Eica, Cache (Rogers). 

 — South Ameeica, as far as the Argentine Eepublic \ 



My specimens, four females, have the brown spot at the tip of the second vein, 

 which, according to Schiner, was wanting in most of his specimens. They differ from 



