NO. 1977. MONOGRAPH OF THE SIONIPhORIN^—GIRAULT. 231 



Caudal wings narrow; longest marginal cilia of fore wing as long or slightly longer 

 than the greatest wing width. 



Sooty brown, the mesoscutellum alone or all parts of the throax excepting pro- 

 notum and cephalic half or third of mesoscutum, orange yellow; abdomen 

 sometimes lighter brown suffused with yellowish at tip or even to proximal 

 half; discal bristle present. Caudal wings very narrow; antennal club uni- 

 formly dusky, subclavate. Distal portion of fumated area caudad, often 

 maculate. Moderately large species. 



Jlavopalliata Ashmead (ocddentalis Howard). 



Sooty brown, the thorax lemon yellow, excepting pronotum and cephalic half 

 of mesoscutum; the distal half of abdomen usually distinctly lighter, suffused 

 with yellowish, the light area with a convex margin proximad; sometimes only 

 tip lighter, sometimes whole distal half yellow crossed in middle by a brown 

 band. Caudal and cephalic wings slightly broader. Antennal club uniformly 

 dusky, subclavate. Moderately large species. The inner margin of the stigmal 

 vein in this species forms a deeper and narrower curve than in the others and 

 the marginal vein just proximad of the curve (at apex of vein) is broader than 

 usual and obtusely rounded. Discal bristle absent townsendi Ashmead. 



Sooty brown or brown, the thorax, except pronotum and cephalic two-thirds 

 of mesoscutum, lemon yellow; in darker specimens abdomen all dark, but 

 lighter distad in lighter brown specimens; discal bristle present; wings as in 

 Jlavopalliata; antennal club shorter, clavate, the antennae yellowish, the club 



dusky at distal third. Small species .fax Girault. 



Caudal wings broad; longest marginal cilia of fore wing only about three-fourths 

 that wing's greatest width. 



Sooty brown, the abdomen darker; mesoscutellum and lateral margins of meso- 

 scutum orange yellow; discal bristle present. Fore wings broad, about twice 

 the width of the posterior wings mexicana Ashmead. 



V. maculata gi'oup. 



Containing but a single species, this group is intermediate between the preceding 

 and the following, though in a sense less related to either than each is to the other. 

 The body of the single species is brown, marked with no yellow, the abdomen either 

 subconcolorous or else dark along each side or almost entirely dark. The group is 

 characterized by the absence of orange or lemon yellow in the general body colora- 

 tion. 



Fore wings fumated out slightly beyond a point between the wing apex and apex of 

 the venation, the portion of the fumated area distad of the apex of the vena- 

 tion (and farther proximad near caudal margin) broken into small spots or 

 maculate; discal bristle absent; longest marginal cilia of fore wing subequal to 

 that wing's greatest width, the cilia long and slender; caudal wings narrow. 

 All of legs and antennae brown maculata Girault. 



VI. aleyrodis group. 



The species of this group are characterized by having a predominance of orange or 

 lemon yellow in their coloration but through townsendi and to a less extent varia- 

 tions oi Jlavopalliata, they are more or less closely related to species group IV. Thus 

 coquilletti of this group is nearly structurally identical with townsendi of the other; 

 if the distal half of the abdomen of townsendi should become wholly orange yellow 

 instead of merely lighter brown or instead of j^ellow broken by a dark band, the 

 two species could not be told apart. The following species: aleyrodis Ashmead, coquil- 

 letti Ashmead, aspidioti Ashraead, Jlava Girault, Jlavella Girault, and basilica Girault. 

 In spite of what has just been written, however, I believe all of these species are 



