6 PROCEEDINGS OP THE NATIONAL, MUSEUM vol.74 



115. ZEUA PLUMOSA Wiedemann 



Dea-ia plumasa Wiedemann, Auss. Zweifl., vol. 2, 1830, p. 370. — Macquart, 

 Dipt. Exot., 3d Suppl., p. 213 (sep. 53). — Bigot, in Sagra's Hist, etc., de 

 l'I.sle de Cuba, 1857, p. 815. 



Leptoda plumosa Brauer and Bergenstamm, Zweifl. Kais. Mus., pt. 5, 1891, 

 p. 102 (gen. ref.). 



One female, " Brasilien, Coll. Winthem," which has lost the anten- 

 nae, palpi, and all of the legs except one front femur. Except as to 

 sex it agrees with Wiedemann's description, and also bears the small 

 red tag of Wiedemann's type material.^ I do not doubt that this 

 is one of the types. 



Pollen of head pale yejlow, more silvery on cheek and parafacial, 

 the yellow a little deeper on the middle of the front. Vertex slightly 

 blackish. Width of front at vertex 0.29 of head width, the eyes 

 diverging uniformly to their lowest curve. Frontal stripe dark 

 brown, slightly narrower than the parafrontal, the usua^ orbital 

 bristles present. Parafacial wide, bare, nearly as wide as the clypeus, 

 which has a very low and indistinct carina above. Epistoma 

 rather strongly projecting. Cheek with four or five bristles next to 

 edge of mouth, above this almost entirely bare. Beard white 

 except its anterior portion, which is black along the ridge extend- 

 ing from the posterior orbit to the mouth. Proboscis small. Thorax 

 graj' pol^inose, dorsum with four distinct black stripes in front, the 

 inner narrow and extending a little behind the suture, where they 

 disappear and are replaced by a median stripe, also narrow, extend- 

 ing to the scutellum; the outer stripes are as usual interrupted at 

 the suture and abbreviated before and behind. Acrostichal 2, 3; 

 dorsocentral 3, 4; humeral 4; posthumeral 3; presutural 1; noto- 

 pleur.al 2; supraalar 3; intraalar 3; postajar 2; sternopleurul 2, 1; 

 scutellum with 2 lateral, one large apical and one fairly large 

 discal pair. 



Abdomen black with slight reddish tinge along the sides and more 

 distinctly at apex. The pollen seems to have a rather characteristic 

 pattern, as mentioned by Wiedemann. It is partially tessellated or 

 changeable, and on the second segment there is a large triangle, 

 rather opaque black in all directions, its apex just about reaching the 

 front edge, the base reaching the tip of the segment, and extending 

 narrowly toward the sides. The third segment is a little rubbed, but 

 apparently had a similar triangle, and more broadly extended along 

 the hind edge. The rather thin, almost silvery pollen of the re- 

 mainder of the second and third segments becomes still thinner along 

 the sides, more dense on the venter. First segment with only a lat- 

 eral pair of bristles, second with a large median marginal pair and 



8 Brauer, Zweifl. Kais. Mus., pt. 1, 1880, p. 105. 



