NO. 1977. MONOGRAPH OF THE SIGNIPHORIN^—OIRAULT. 205 



differs — tlie caudal margin of the stigmal vein and that of the mar- 

 ginal at apex unite in a distinct concave curve as in jiavopalliata 

 Ashmead; the discal bristle is absent, as is also the oblique crease. 



The proximal tarsal joint of the intermediate legs is much longer 

 than the same joint of the caudal legs, which, however is as long as 

 in nigra. The middle tibial spur is long and slender and bears 

 about 10 spines; apimrently the cephalic tibial spur is many-tined 

 as in flavopalliata; caudal tibial spur single, short, straight. The 

 species may be distinguished irom. flavopalliata structurally through 

 the fact that it is larger and more robust, the caudal wings are much 

 broader, the broader fore wings and their somewhat shorter marginal 

 cilia, the very much longer proximal tarsal joints of the last two 

 pairs of legs and the longer stigmal vein. Colorationally, of course, 

 easily distinguished from flavopalliata. Also allied with maxima, 

 pulchra, and nigrella ^ ; from these species it differs in those points 

 brought out in the table of species given later. Its caudal wings are 

 somewhat broader than those of both pulchra and nigrella. Female 

 unknown. 



The following specimens have been studied : The^ two type speci- 

 mens (both males ?) in the United States National Museum collection 

 now remounted on a single slide in xylol-balsam; they were and are 

 labeled "SignipTiora noacki Ashm., female. Type No. 4773, U.S.N.M. 

 7760°. Par: in Psyllid on wild shrub. San Paulo, Brazil, Oct. 97." 



Habitat. — South America — Brazil (Sao Paulo). 



Host. — A psyllid on a wild shrub. 



Types. — The two males as indicated above. 



6. SIGNIPHORA UNIFASCIATA Ashmead. 

 Signiphora unifasciata Ashmead, 1900, pp. 409, 410, 411. 

 The original description is as follows : 



Female. — Length, about 0.70 mm. Black, with a narrow yellowish-white band 

 across base of scutellum and continued below on the hind margin of the mesopleura 

 and along the mesosternal suture; tarsi white, wings hyaline. 



Type.~C&t. No. 4774, U.S.N.M. 



Habitat. — Florida: Georgiana. (Dr. Wittfield.) 



Host. — Rhynch: Ceropsylla sideroxyli Riley. 



This species also belongs to the nigra group but on account of its 

 coloration is placed in a group of its own; it is correctly described 

 but the wings are not hyaline; the body is opaque black and finely 

 polygonally sculptured. Structurally it resembles noacki Ashmead 

 but may be distinguished by these characters; the stigmal vein is 

 shaped differently; its inner or caudal margin is convex rather than 

 concave and does not form a regular concave curve with the inner 

 margin of the marginal vein but only an obtuse angle; its cephalic 



1 All three described later on in this paper. 



