180 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



TABLE OF SPECIES. 



1. — Legs black ; third abdominal segment with an entire yellow cross-band, the first 



segmcHt without yellow spots clncta 



The four front legs, at least, not black ; third segment with a pair of spots, first 



segment also with yellow 2 



2. — Terminal joints of the tarsi black ; the dorsal suture with four distinct spots. 



decora 

 Tarsi wholly light colored ; spots on suture coulescent into an interrupted band 3 

 -3. — Black species ; hind femora in part black ; abdomen considerably narrowed pos- 

 teriorly crucigera 



Abdomen and head yellowish reddish ; legs without black ; abdomen moderately 

 narrowed posteriorly ruficma 



Pteroptila crucigera. (Plate VIII, figs. 1, la, lb, Ic.) 



? MUema acuta Fabricius, Syst. Antl., 189, 7 ; Wiedemann, Auss. Zw. Ins., ii, 110, 8 



(translation from Fabricius). 

 Milesia crucigera Wiederaanu, Auss. Zw. lus., ii, 105,2. 

 Mallota milexiformu Macquart, Hist. Nat. Dipt., i, 500. 

 Plagioeera crucigera Macquart, Dipt. Exot. , ii, 2, 60, 1 ; pi. x, tig. 7. 



Habitat. — Georgia, Florida, Texas! Yucatan (Macq.). 



<?,$. Length, 14 to 15™". Antennae reddisb brown. Face yellow- 

 ish red, thickly clothed on the sides with whitish pollen and bright yel- 

 low pile ; a broad median stripe and the cheeks shining black, some- 

 times reddish. Front in female narrow above, with a broad black 

 stripe, yellow pilose on the sides below the ocelli ; frontal triangle with 

 a slender triangular black spot; posterior orbits with abundant short 

 yellow pile. Thorax black, but little shining, in front with two opaque 

 black stripes, not reaching the suture; clothed with very short black 

 pile and with markings of short, thick, bright-yellow pile as follows : 

 an oval spot on each side of the middle in front ; a fascia extending 

 along the suture, broadly interrupted in the middle and continued out- 

 wardly to a spot on the steruopleurae ; another transverse fascia ex- 

 tends across in front of the scutellum, narrowed on the sides before 

 reaching the spots on the post-alar callosities ; the anterior spiracles 

 just below the humeri are light yellow, and the posterior pair on the 

 sides of the mentanotum white. Scutellum yellowish on its border. 

 Abdomen black, somewhat shining; the first segment and anterior part 

 of second opaque ; first segment with a pair of oval spots of yellow 

 pile on the hind partj second segment with narrow posterior yellow 

 margin ; third segment with a yellow pilose spot on each side in front, 

 and a quite narrow yellow hind margin ; fourth segment similar, but 

 the spots smaller, and the hind margin very narrow or obsolete. Hy- 

 popygium shining reddish brown, slightly yellowish pollinose. Legs 

 light reddish yellow, the hind femora in large part blackish. Wings 

 on the basal portion in front as far as the cross-veins yellowish; beyond 

 dark brown, filling out the sub-costal, the marginal, submarginal, outer 

 part of first basal, and the anterior part of first posterior cells. 



Five specimens. 



