60 PKOCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



lamellae long and narrow, black, yellow at base, fringed with long 

 hairs. 



Coxae, femora, tibiae, and fore tarsi wholly yellow; middle and 

 hind tarsi brown, more yellow at base; joints of fore tarsi as 

 20-9-7-6-5; of middle ones as 25-16-14-10-8; joints of posterior 

 pair as 23-32-21-15-11. Calypters and halteres yellow, the former 

 with rather long black cilia. 



Wings grayish; third vein a little arched; last section of fourth 

 vein bent at forty-fiftieths of a millimeter beyond the cross vein, 

 beyond this bend it is thirt^'-fiftieths to wing margin and a very 

 little arched, its tip before the apex of the wing ; last section of fifth 

 vein 23, cross vein twelve-fiftieths of a millimeter long; cross vein 

 slightly oblique; hind margin of wing scarcely indented at tip of 

 fifth vein. 



Described from one male taken by J. M. Aldrich, May 1, 1926, at 

 El Salto, Guatemala. 



Type.—UniQ, Cat. No. 41071, U.S.N.jM. 



PELASTONEURUS FUSCIPENNIS, new species 



FeiTude. — Length, 3 mm. Face wide, brown pollinose with a nar- 

 row edge of white pollen along the orbits and extending to the tip, 

 the suture very high, making the lower portion about twice as long 

 as upper part, it is very bulging and quite pointed at tip, extending 

 nearl}^ or quite to the lower corner of the eyes; palpi large, brown, 

 covered with whitish pollen and black hair; front with the brown 

 pollen of the face extending up to the ocellar tubercle, the tubercle 

 and a narrow band on the orbits blue-black; lateral and inferior 

 orbital cilia yellowish white; antennae yellow, mo.st of third joint 

 and arista brown; arista feathered with long scattering hairs. 



Thorax wholly black, in the type somewhat shining. Abdomen 

 black, metallic, posterior half of the segments a little coppery, dorsum 

 dulled with brown pollen, sides of segments with spots of white 

 pollen. 



Fore coxae and all femora, tibiae and basitarsi yellow, all tarsi 

 black from the tip of the first joint; middle and hind coxae black; 

 joints of fore tarsi as 29-13-9-6-8; of middle ones as 38-20-18-10-10; 

 first two joints of posterior tarsi as 29-39. Calj^^ters and halteres 

 brownish yellow, apical half or more of the knobs of the halteres 

 yellow, cilia of the calypters black. 



Wings tinged with blackish, posterior cefc a little lighter, cross 

 vein and a spot on bend of fourth vein darker; last section of fifth 

 vein, if extended to tlie wing margin, would be 22, cross vein nineteen- 

 fiftieths of a millimeter long; last section of fourth vein from the 

 cross vein to the bend 35, from the bend to tip of fourth vein at wing 



