ART. 21 ACALYPTEATE FLIES MALLOCH 27 



SCHILDOMYIA VITTITHORAX, new spedea 



Female. — Head clay colored, with the following dark brown marks . 

 A streak over ocelli to vertex, interfrontalia except the triangle, a 

 spot at base of each orbital bristle, one between antennal base and eye, 

 and a large portion of each side of occiput ; antennae fuscous, base of 

 third segment on inner side yellowish; palpi testaceous yellow. 

 Thorax testaceous, densely pale gray pruinescent, with three broad 

 chocolate brown vittae, the median one not extending to posterior 

 margin except as a narrow point, a dark spot at base of each dorso- 

 central bristle, a large dark mark on each side of scutellum, a fainter 

 vitta on middle of mesopleura and pteropleura and a mark on sterno- 

 pleura. Abdomen testaceus, with sides of disk of first visible tergite 

 blackish brown, second, third, and fourth tergites almost black, with 

 pale gray pruinescent markings on hind margins. Legs yellow testa- 

 ceous, femora with one, tibiae each with two faint dark annuli. 

 Wings hyaline, cross veins not distinctly clouded. Halteres yellow. 



Frons longer than wide, a rather noticeable group of short setulose 

 hairs at bases of the two anterior orbital bristles; arista plumose; 

 cheek nearly half as high as eye, the latter longer than high. Discal 

 thoracic hairs weak ; basal pair of scutellar bristles about half as long 

 as apical pair. Outer cross vein at its own length from inner and 

 two-thirds that length from apex of fifth vein ; last section of fourth 

 vein about four times as long as preceding section. 



Length, 3.5 mm. 



Type and 1 paratype. — Higuito, San Mateo, Costa Rica (P. 

 Schild). Paratype, Cano Saddle, Gatun Lake, Panama Canal Zone, 

 August 5, 1923 (R. C. Shannon). Cat. No. 28460, U.S.N.M. 



SCHILDOMYIA BREVIHIRTA, new species 



Male. — Differs from the preceding species in having no dark spots 

 at bases of the frontal orbital bristles and antennae, in having two 

 faint dark spots above mouth margin on face, the median thoracic 

 vitta is narrowed on posterior third, but does not terminate in a nar- 

 row point, the lateral vitta3 are narrower and do not extend to mar- 

 gins. 



The arista is very short haired. Prescutellar pair of acrostichal 

 bristles present. Outer cross vein at about half its own length from 

 inner, last section of fourth vein bent forward a little apically, as 

 long as antepenultimate section and six or seven times as long as 

 penultimate. 



Length, 4.5 mm. 



Type. — Cano Saddle, Gatun Lake, Panama Canal Zone, August 

 5, 1923. Paratype, Monto Lirio, Panama, April 6, 1923 (R. C. Shan- 

 non) . Cat. No. 28461, U.S.N.M. 



