176 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



tudinal hyaline line some distance from the posterior margin, the 

 cut-off portion narrower and somewhat less deeply pigmented. 



Male. — Not known. 



Described from one female (type), Oracle, Arizona, May 7 (Hub- 

 bard and Schwarz). 



Type.— Cat. No. 22044, U.S.N.M. 



Genus ISODROMUS Howard. 



Isodromus Howard, Rep. Entom.. U. S. Dept. Agric, for 1886. 1887. p. 488, 



pi. 3, fig. 1. 

 Parataneostigma Girault, Annals Entom. See. Amer., vol. 8, Oct., 1915, p. 275 



This genus is similar to Homalotylus in general structure, but 

 differs in details as follows: 



Female. — Head thicker fronto-occipi tally, not subhemispherical as 

 the face is distinctly inflexed; a little wider than the mesoscutum, as 

 wide as long or a little wider than long, as seen from in front the out- 

 line circular above, but below the cheeks converge in a straight line 

 to a slight extent and the oral margin is broadly truncate; as seen 

 from the side the outline is sub triangular, the outline of vertex 

 rounded, the dorsal side of head being strongly convex, its plane 

 meeting the plane of the face at somewhat more than a right angle 

 as in iceryae or in a strongly obtuse angle as in idger; occiput slightly 

 more concave above than in HGmaloiylus but yet only moderately so. 

 the vertico-occipital margin rather sharp; frontovertex moderately 

 wide, the dorsal orbits of eyes only slightly or hardly perceptibly 

 diverging anteriorly; ocelli in an equilateral or a somewhat more 

 acute-angled triangle, the posterior pair touching or nearly touching 

 the eye-margins; eyes shorter than in Homalotylus or considerably 

 less than twice as long as wide, their long axis parallel with the plane 

 of frontovertex, the postorbital space on the sides of head remaining 

 broad as in Homalotylus, and posteriority the eyes meet or almost 

 meet the vertico-occipital margin; cheeks about as long as the width 

 of the eyes as in iceryae or about two-thirds or three-fourths as long 

 as in most species; face about as wide as long, the scrobes in the 

 form of distinct and narrow furrows, converging above but not 

 meeting, the space between the antennal sockets slightly convex but 

 not prominently elevated. Antennae inserted as in Homalotylus 

 shorter and somewhat more robust; scape of the same shape but 

 shorter, the radicle joint about an eighth or tenth of the total length; 

 pedicel as long as the first two funicle joints combined; funicle cylin 

 drical, increasing slightly in thickness distad, the basal joints about 

 iS long as thick, the apical ones somewhat wider than long; club 

 wider across the base than apex of funicle, as long or a little longer 

 than the last three funicle joints combined, and obliquel}" truncate 

 on the inner side to the basal third or fourth. ^Mandibles robust, 



