-Williston.] ^^^ [May 19, 



Sphecomyia Pattoxit, sp. nov. 



(^ 9 • Antennae reddish-black, very short, joints nearly of the same 

 length ; the first cylindrical, the second sub-triangular, the third rounded, 

 reddish below ; arista reddish. Face golden yellow, with a black stripe 

 reaching from the antennae to the oral margin, cheeks black ; front in 

 female black with a golden spot on each side. Thorax black, a large spot 

 on the pleur* and a smaller one under it, humeri and basal part of scutel- 

 lum yellow. Abdomen black ; first segment with a narrow posterior bor- 

 der, second segment with two narrow yellow cross-bands ; the anterior 

 one near the middle of the segment broadly interrupted, the posterior 

 marginal one entire ; third and fourth seginents similar, the middle cross- 

 bands successively a little wider and less broadly interrupted ; fifth seg- 

 ment nearly all yellow. Femora brownish-black at the base, becoming 

 reddish at the end, especially on the posterior pair. Anterior tibiae, except 

 the base and tarsi, quite black, middle and posterior tibiae and tarsi, ex- 

 cept the last two joints, reddish-yellow. Wings tinged with brownish 

 along the veins, hyaline in the middle of the cells. Long. corp. 13-14 mm. 

 Two specimens. "Washington Territory. 



This species is very like Sphecomyia brevicornis O. S., but difiers in the 

 antennae being still shorter, and the picture of the al)domen diftercut. 



mm.^— Antennae short, situated low down, near the middle of head in pro- 

 file, the projection less prominent ; face not much produced, not 



longer than the front Temnostoma. 



gg. — Larger pilose species, the abdomen always with short, furry pile ; 

 dorsum of thorax never with yellow markings other than on the 

 humeri. 

 n. — Scutellum, margin and pleura of thorax with bristly hairs ; face 

 distinctly tubcrculate ; femora slender ; abdomen uniform me- 

 tallic, not banded Chrysochlamys. 



- The following table of the North American species I reproduce from 

 Osten Sacken (West. Dipt., 340), without change : 



Arista black crcesus. 



Arista reddish. 



Leg entirely reddish -yellow dives. 



Anterior femora at base and tips of all the tarsi black buccata. 



All the femora brown ; tibiae likewise iufuscated nigripes. 



Chrysochlamys croesus O. Sacken. West. Dipt., 341. Washington 

 Terr., California ! Utah. 



nn. — Thorax without any bristly hairs. 



o. — Face short, not produced, extending but very little below the 

 eyes, shorter than the front, concave from antenna^ to tip, 

 not tuberculate, transversely arched, hind femora more or 

 less thickened. 

 p. — Abdomen elongate, hind femora with short spinous bristles 

 below Brachypalpus. 



