430 LIST OF niPTERA. 



A. Mystax albus. rapax, Walk. 



B. Mystax niger. .... melanogasler, IVied. 



111. DaSYPOOON BAPAX. 



Dasypogon rapax, Diptera Saundersiana, Pi. 2, 88. 



112. Dasypogon MELANOOASTEB. 



Ochraceo-fuscus ; abdomen alrum ; alho fasciatum ; pedes badii . 

 alajlavescenles. 



Dasypogon melanogaster, Wicd. Macq. Dipt. Exot. i. 2, 36, 6. 

 Brazil. 



Group 4. 



Corpus gpracile, sapissime fulvum aut testaceum. Caput 

 breve, tborace paullo latius ; frons et facies plana. Mystax rarus, 

 setis nonniiUis albis apud peristoma. Anteiinavum articulus lus 

 linearis, 2us brevis, obconicus; 3us fusifonnis, lo et 2o conjunctiin 

 ajqualis aut mullo longior. Sexualia parva. Femora et tibise 

 parce setosa ; ungues mediocres ; onychia parva ; tibiae antica? cal- 

 caribus minimis. 



Eyes flat in front, wbere tbe facets are much larger than those 

 elsewhere. Forks of the cubital vein nearly straight, their base 

 opposite the tij) of the liiscal areolet. First and second externo- 

 medial veins proceeding direct to the border ; third angular, and 

 connected with the fourth at some distance fnini the border. Sub- 

 anal very nearly connected with the anal on the border. 



A. Alae fusc<T. 



A. Abdomen ferrugineum. . . - Duillius, Walk 



B. Abdomen piceum. 



A. Ala? non vittatar. - - . . testaccus, /air. 



n. Alee vittu limpida. . - - . insertus, Walk. 



B. Ala- pallide fuscame venis flavido liinbalis. castancus, Macq. 



C. Alae bubfulvjB aut flavesceules. 



