"WTEOMYIA BLOISA 121 



Wyeomyia cacodela, and no doubt all the ffeZtcoiHO-inliabiting species have 

 similar habits. 



Northern coast of South America. 



Montserrat, Trinidad, June 28, 1905 (A. Busck) ; Maraval, Trinidad (P. W. 

 Urich) ; Arima, Trinidad, 1906 (P. W. TJrich) ; Tabernilla, Canal Zone, 

 Panama, April 14, 1909 (A. H. Jennings). 



This species was at first determined as Wyeomyia ulocoma, a species inhabit- 

 ing Guiana, and with which we are unacquainted except by Dr. Howard's notes 

 on the type. He reports that the prothoracic lobes are denuded of scales, there 

 is no white margin on the eyes, and the middle feet are without white. The 

 types are evidently in such poor condition that their exact determination is im- 

 possible, and the exact position of Wyeomyia ulocoma must remain unknown 

 until better material has been obtained from the type locality. It is therefore 

 impossible to say that Wyeomyia pseudopecten may not be the same species, 

 although, considering the considerable number of species of Wyeomyia that 

 occur in each locality, this seems to us improbable. Moreover, the flower-breed- 

 ing forms are seldom taken unless bred, and the captured types of Wyeomyia 

 ulocoma are more probably of some tree-hole or bromelia-breeding species. "We 

 therefore retain the name Wyeomyia pseudopecten for the form before us. Por 

 some time we considered that this species was confined to Trinidad and did not 

 extend to the mainland ; but Mr. Jennings has obtained undoubted pseudopecten 

 in the Canal Zone. 



This species shows a strong pale-brassy luster on the hind tarsi, appearing 

 almost silvery white in certain lights. This makes it additionally difiBcult to 

 determine the white tarsal markings. Otherwise W. pseudopecten appears to be 

 identical in coloration with the two species which follow (W. eloisa and W. 

 pantoia) ; they are, however, abundantly distinct on the characters of the male 

 genitalia. 



In the larva, the number of teeth in the false pecten on the breathing tube 

 varies from two to five, and usually differs on the two sides. This' is also true of 

 the same structure in the three species which follow (eloisa, pantoia and 

 onidus). The ante-antennal tufts also vary and may consist of two or three 

 hairs. 



WYEOMYIA ELOISA, new species. 

 Desceiption op Femai-e, Male, and Laeva of Wyeomyia eloisa: 



Female. — Proboscis rather short, swollen apically, vestiture black with a 

 bronzy reflection, brighter beneath ; labellae small, rounded, with fine outstand- 

 ing setae. Palpi short, fiattened, one-sixth as long as proboscis, bronzy black. 

 Antennje moderate, the joints slender, subequal, rugose, coarsely pilose, black ; 

 tori subspherical, with a cup-shaped apical excavation, luteous brown, with a 

 whitish pruinosity; hairs of whorls long, rather sparse, black. Clypeus 

 rounded, convex, brown, pruinose. Byes separated at vertex by a narrow wedge, 

 bluish black. Occiput clothed with flat blackish scales with a metallic reflec- 

 tion, a small white spot at the vertex, continued narrowly along eyes and ex- 

 panded to a patch below, a median longitudinal shade, pale, with iridescent 

 reflection ; two long bristles at the vertex and a row of shorter ones along margin 

 of eyes. 



Prothoracic lobes elliptical, well separated, clothed with flat scales, dark 

 bronzy brown, a row of setae along anterior margin. Mesonotum clothed with 

 flat brown scales, with a bronzy and blue reflection; a few pale scales at anterior 

 margin, those below lateral angles pale with blue luster; setas over roots of 

 wings black. Scutellum trilobate, with vestiture similar to and continuous with 

 that of mesonotum, each lobe with a small tuft of black bristles. Postnotum 



