BIOLOGIA CENTRALI-AMERICANA. 



Z00L0GIA. 



Class INSECTA. 

 Order DIPTERA. 



Fam. SYEPHID^l*. 



MIXOGASTEK. 

 Miwogaster, Macquart, Dipt. Exot. ii. 2, p. 14 (1842) . 



1. Mixogaster mexicana. 



Miocogaster mexicanus, Macq. Dipt. Exot. l er Suppl. p. 123, t. 10. f. 15 \ 



Hab. Mexico \ Omilteme in Guerrero 8000 feet, Chilpancingo 4600 feet (H. H 

 Smith). 



Frve specimens. Easily distinguished from M. conopsoides by the shorter antennse, 

 which are not much longer than the front. 



2. MixOgaster bellula, sp. n., d. (Tab. I. figg. 1,<?; la, head in profile; 

 1 b, head seen from in front.) 



Eace reddish-yellow, with a median black stripe and light yellow pile. Antennae longer than the face j first 

 joint slender, black, yellow atthe base > second and third joints ashy-black ; third joint thickened, spindle- 

 shaped. Least width of front equal to about half the distance from the foremost ocellus to the base of the 

 antennse ; front, below the constriction, black, not shining, with yellow pile, above forming a large, bare, 

 shining black tubercle. Eyes bare. Thoras opaque black ; the dorsum of the scutellum, and a narrow, 

 broadly interrupted band on the mesonotum, extending on the pleurte, clothed with golden-yellow, 

 appressed pile. Abdomen opaque black ; second segment with two long, narrow, yellowish-white stripes, 

 which are separated from each other and from the lateral margins by a slender black space ; third segment 

 with a narrow, golden-yeUow-pilose posterior band ; fourth segment broadly, triangularly, sparsely yeUow- 

 pilose behind. Legs dark brown, the base of all the tibise light yellow ; hind tarsi elongate and dilated. 

 Wings nearly hyaline; base of the marginal cell and a cloud along the third vein brown; no stump on 



* By S. W. Williston. 



biol. cente.-amer., Dipt., Vol. III., December 1891. 



