ART. 21 ACALYPTRATE FLIES MALLOCH O 



This is the largest species of the 2:eniis known to me and the 

 only one so far described in which the wings are distinctly pictured. 

 The wang markings resemble those of StenoJauxania striata de- 

 scribed in this paper. 



CEPHALELLA, new genus 



Generic characters. — Resembles Lauxaniella ]\Ialloch, having the 

 antennae similar and the anterior orbital bristle sloping backwards. 

 The face is prominently convex, wath a large rounded convexity 

 outstanding on each side ; the labrum is exposed and over half 

 as high as face below antennae; the postverticals are of moderate 

 size, situated just below the sharp vertex; ocelli small and quite 

 close, no ocellars present; eye higher than long. Propleural bristles 

 indistinguishable; sternopleural 1. 



Genotype. — CephaleUa jutnipennis. new species. 



CEPHALELLA FUMIPENNIS, new species 



Female. — Head shining testaceous yellow, a small blackish mark 

 on ©cellar region and another at base of each anterior orbital 

 bristle, the large lateral facial convexities and labrum deep black, 

 with a violet tinge, centre of latter yellow; third antennal segment 

 and palpi fuscous. Thorax testaceous yellow, dorsum anteriorly 

 with lateral margins and three discal vittae fuscous, these posteriorly 

 entirely fused; pleura yellowish only anteriorly and on lower pos- 

 terior portion. Abdomen shining black. Legs testaceous yellow, 

 fore tarsi black, apices of fore femora, of hind tibiae, and of mid 

 and hind tarsi, darkened. Wings brown, paler posteriorly and in 

 centre of cells. Halteres brown. 



Head higher than long; frons about 1.5 as long as wide and 

 fully one-third of the head width, surface glossy, orbits not differ- 

 entiated, bristles of moderate length, hairs absent; antennae elong- 

 ate, basal segment as long as second, haired at apex below, the two 

 combined about one-fourth as long as third, the latter slender, 

 about ten times as long as wide; arista shorter than third antennal 

 segment, plumose. Thorax elongate, with two or three pairs of 

 dorsocentrals in front of scutellum and a series of hairs in line 

 with them anteriorly. Fore femur without antero ventral comb; 

 fore tibia and tarsi thickened. Inner cross vein at about two-fifths 

 from apex of discal cell; outer at full}^ its own length from apex 

 of fifth; last section of fourth about 2.25 as long as preceding 

 section. 



Length, 5 mm. 



Type. — Higuito, San Mateo, Costa Rica (P. Schild). Cat. No. 

 28439, U.S.N.M. 



