EXOPEOSOPA.— HTPEEALONIA. 89 



difficult to distinguish. Many species belonging here have been described before, and 

 would hardly be recognizable without the comparison of typical specimens. A large 

 material brought together from an extensive territory would enable one to draw com- 

 parative descriptions, which alone would be recognizable. I therefore abstain from 

 describing some species of this group which I find among my material or in Professor 

 Bellardi's collection. 



HYPERALONIA. 



Hyperalonia, Rondani, Archivio per la Zool. Modena, iii. p. 1 (1864). 



Four submarginal cells ; no teeth at the base of the ungues ; no pulvilli ; strong posterior legs ; small bristleless 

 front tibiae, with indistinctly marked joints of the tarsi and minute ungues ; the front tarsi have no stronger 

 bristles, but are provided on both sides with delicate, erect hairs ; the third antennal joint in the shape 

 of an elongate cone, separated by a distinct suture from a style nearly as long as the cone, a minute 

 appendage at the tip of the style ; the face but moderately projecting. 



All the Hyperalonice I have had occasion to examine (from the warmer regions of 

 America and Asia ; I have seen no others) partake of the above characters. The genus 

 is very closely allied to Exoprosopa. (Compare the introductory paragraph to that 

 genus, ante p. 81.) 



The species described below form two natural groups : — 



A. Abdomen with a white cross-band on the second segment, but without distinctly marked- white 



spots. 



1. albiventris, Macq. (v. d. Wulp) ; 2. pilatei, Macq. ; 3. dido, sp. n. 



B. Abdomen with distinctly marked white spots on the sides. 



4. proserpina, Wiedem. ; 5. latreillei, Wiedem. ; 6. kaupi, Jaenn. 



l. Hyperalonia albiventris. 



(?) Eocoprosopa albiventris, Macq. Dipt. Exot. Suppl. iii. p. 33, t. 3. f . 8 \ 

 Exoprosopa albiventris, Van der Wulp, Tijdschr. &c. xxiv. p. 164, t. 15. f. 11 2 . 

 Anthrax hela, Erichs., in Schomburgk's Reise in Brit. Guiana, iii. p. 608 3 . 



Four submarginal cells ; wings greyish-hyaline, with brown spots on most of the cross-veins ; abdomen with a 



broad white cross-band on the second segment, and with silvery scales towards the tip. 

 Length 15-18 millim. 



Hab. Mexico, Northern Sonora (Morrison) ; Guatemala, Teleman (Champion). — 

 Venezuela 2 ; Guiana 3 ; Brazil \ Eio Negro K 



Macquart's description * is unmeaning, and I take that of Van der Wulp 2 as a basis of 

 comparison. 



1. A female from Teleman, Vera Paz, Guatemala, agrees with the description; but 

 the spots on the wings are smaller, and some of the shadows, represented on the figure, 

 are wanting ; the anterior cross-vein corresponds exactly to the bifurcation of the second 

 and third veins ; some of the veins are less wavy. The long hairs on the thorax are 



biol. CENTK.-AMER., Dipt., November 1886. n 



