D1PTERA. 247 



or more, the yellow extending up in the middle and somewhat dilated below the ocelli ; occipital margin 

 of the front narrowly yellow, save just behind the ocellar tubercle. Face prominent in the middle, 

 yellow, with a large black shield-shaped spot in the centre, reaching from the root of the antennae to the 

 oral margin in front and to the lateral grooves on the side. Posterior orbits yellow. Mesonotum black, 

 with rather abundant yellow pile and tomentum. Scutellum yellow, black at the base ; spines small. 

 Pleuraa black and yellow. Abdomen black ; second and third segments with a large yellow spot on each 

 side, extending acutely inward on the posterior margin, but not meeting ; anterior angles of the third 

 segment with a black spot ; fourth segment with a posterior narrowly interrupted band ; fifth segment 

 with a narrow yellow hind-margin. Legs black, the proximal portion of all the tibiae and of the middle 

 metatarsi yellow. Third vein of the wings with an anterior branch. Length 13 millim. 



Hab. Mexico, Guadalajara in Jalisco (Edge). 

 One specimen. 



7. Odontomyia concinnata, sp. n. 



c? . Head broader than the thorax. Eyes bare. Frontal triangle and face shining black, the latter prominent 

 and broadly yellow below. First two joints of the antennae reddish-yellow, the second joint a little 

 shorter than the first ; third joint brown, becoming blackish distally, not twice the length of the first two 

 joints together. Mesonotum, except a small yellow spot on the post-alar callosities, wholly black, with 

 short yellowish pile. Scutellum greenish-yellow, narrowly black at the base, the spines of moderate size. 

 Pleura? black, with the anterior part reaching back as a stripe below the root of the wings, and a small 

 spot on the mesosternum, greenish-yellow. Abdomen : first segment opaque black ; second and third 

 segments yellow, the two together showing a large, hourglass-shaped spot or median portion ; fourth 

 segment black, with the lateral margins, dilated posteriorly, yellow ; fifth segment black, with a yellow 

 margin. Yenter greenish-yellow. Legs : femora brown and black, with the proximal portion, on the 

 front pair narrowly, on the posterior pair broadly, yellow ; tibiae black, yellow on the proximal portion ; 

 tarsi black, the metatarsi, except the tip, yellow. Stigmatic portion of the wings brown ; anterior branch 

 of the third vein indistinct. Length 10 millim. 



Hab. Mexico, Venta de Zopilote in Guerrero (H. II. Smith). 



One specimen. This species seems to be allied to the Mexican 0. dissimilis, Bellardi, 

 but may be distinguished by the spots on the pleurae and the colour of the femora. 



8. Odontomyia rubicornis. 



Odontomyia rubicornis, Macq. Dipt. Exot., Suppl. i. p. 181 \ 



Hab. Mexico, Teapa in Tabasco (H. II. Smith), Merida in Yucatan 1 . 



A single male specimen from Teapa, resembling 0. quadrimaculata, but smaller 

 (length 7 millim.). The eyes are nearly bare, the scutellum has a narrow yellowish 

 border, the spots on the abdomen are larger, and the tibiae and tarsi are yellow, the 

 latter infuseated at the tip. In 0. quadrimaculata the eyes have a long and abundant 

 pilosity. 



9. Odontomyia (?) comma, sp. n. 



5 . Antennae longer than the head, the first two joints elongate, the second about two-thirds the length of the 

 first, and the third of nearly the same length as the first two together. Deep black throughout, with the 

 following parts yellow : two triangular spots on the sides of the front, the lower one smaller and situated 

 just above the root of the antennae ; a transverse, narrow band on the face, a little above the oral margin ; 



