INSECUTOR INSCITI^ MENSTRUUS 89 



Stoutest, but does not form a differentiated spine. Harpagones 

 with the base widened and pilose, the shaft long, bent, with a 

 seta just before the end ; filament shortly sickle-shaped, round- 

 edly expanded on the inner side, not angled. Harpes normal. 

 Basal appendages short, with four or five stout setse. 



Psorcphora (Janthinosoma) oblita Lynch Arribalzaga. 



This species was described from a damaged male. A single 

 female sent by Seiior Brethes, captured by M. S. Pennington 

 at Quilmes, Province of Buenos Aires, Argentina, April 11, 

 1918, seems to correspond. 



Mesonotum with small blackish scales, sparsely intermixed 

 with ovate pale yellow ones, giving the frosted appearance 

 described by the author ; abdomen metallic blue-black above, 

 without bands, lateral yellow spots, widened posteriorly ; 

 venter mostly black, the anterior parts of segments yellow, 

 more so toward base ; legs with bronzy black scales which 

 take a blue reflection on tibige, hind tibiae and tarsi with out- 

 standing scales about as long as the setse, the tip of the third 

 hind tarsal white, fourth and fifth missing. This differs in 

 no way from P. centrale ^xht\\ts=^ posticatus Wied. In good 

 specimens before me, the frosty appearance of the mesonotum 

 is lacking. I think the following synonymy will obtain : 



PsoROPHORA (Janthinosoma) posticatus Wiedemann. 



Culex posticatus Wiedemann, Dipt. Exot., i,'43, 1821. 

 Janthinosoma ? oblita Lynch, Rev. Mus. de La Plata, ii, 154, 1891. 

 Janthinosoma echinata Grabham, Can. Ent., xxxviii, 311, 1906. 

 Janthinosoma coquilletti Theobald, Mon. Culic, iv, 153, 1907. 

 Janthinosoma jamaicensis Theobald, Mon. Culic, iv, 157, 1907. 

 Janthinosoma centrahe Brethes, Bol. Inst. Ent. y Pat. Veg., i, 

 20, 1912. 



