AMERICAN DIPTEKA. 373 



terior legs, hind tibia with fine setulre. Ovipositor of female very 

 stout and heavily chitinized, black, more or less shovel-shaped and 

 blunt at the tip. 



This genus resembles Melaloncha, but differs by the broad front, 

 bare legs, forked third vein, and blunt ovipositor. It is represented 

 by two species, both from the United States. 



Table of Species. 



1. Ovipositor shovel-shaped, twice as long as broad, broad at base, and equally so 



at apex, constricted at the middle. Front black, . pergamlei Coq. 



Ovipositor narrow, pointed bluntly at the apex, four times as long as broad. 



Front yellow \» heeler j sp. nov. 



Apoceplialus pergandei Coq. (Plate viii, figs. 47, 48.) 

 Coquillet, Proc. Ent. Soc. Wash., iv (1901). 

 Female. Length 2 mm. — Yellow, except front, ovipositor and markings upon 

 abdomen. Front black, not shining, about as broad as long, ocellar tubercle and 

 impressed median line very distinct, bristles of second frontal row two in number 

 and placed near to the eye margin. Antenna lemon-yellow, third joint oval, 

 rather large, with a short, almost bare black arista. Palpi very small and hardly 

 at all bristly, yellow. Cheeks each with two rather small macrochaetae. Thoracic 

 dorsum yellow, with a single pair of dorsocentral macrochaetas and two strong 

 marginal scutellar bristles. Second to fifth abdominal segments each with lateral 

 black spots; second also with a pair of more median ones; sixth segment black, 

 ovipositor piceous; venter yellow, except the last segment which is black; sides 

 of all the segments, especially the third to sixth, fringed with stiff black hairs. 

 Ovipositor flat, shovel -shaped, twice as long as broad, as wide at apex as at base 

 and constricted in the middle. Legs pale yellow, hind tibiae and all the tarsi 

 lined with black. Hind tibiae delicately setulose behind, their femora weakly 

 ciliated with black hairs below near the apex. Spurs of middle and hind tibiae 

 long. Wings rather long and of even width, costal vein reaching not quite to 

 the middle of the wing, its cilia very fine and closely placed. First vein ending 

 two-thirds of the way from the humeral cross-vein to the tip of the costal ; second 

 vein very close to the third at its tip, i. e., angle of furcation very acute; fourth 

 vein evenly curved, seventh vein distinct. Halteres pale, black at extreme tips. 



I have seen two females belonging to this species, — one from 

 Frankford, Pa., collected by Mr. H. W. Wenzel, and kindly loaned 

 to me by Mr. C. W. Johnson, and another specimen from Austin, 

 Texas, found in a nest of Camponotus maculatus, var. sansabeanus 

 Bkly., by Mr. A. L. Melander. 



Apoceplialus wheeleri sp. nov. (Plate viii, fig. 49.) 



Female. Length 2 mm., of wing 2.7 mm. Wholly yellow, ocellar tubercle, a 



spot below each wing and posterior part of middle coxae brown, ovipositor shining 



black. Head yellow, front more than twice as wide as long. The bristles of the 



second frontal row placed in the middle and almost above the lowest pair of re- 



TRANS. AM. KNT. SOC. XXIX. DECEMBER, 1903 



