252 CHARLES W. JOHNSON. 



wanting. Thorax black, with thin yellowish pubescence; lateral stripe and two 

 small spots on the disc of the thorax green, this latter character is variable, and 

 may be wanting, or may be narrowly connected with humeri in some specimens, 

 or with the posterior angle in others, or with both humeri and posterior angles, 

 thus forming two irregular stripes ; pleurae green ; pectus brownish ; scutellum 

 totally green ; tips of the spines brack, ractanotum black. Abdomen green, 

 marked with black as follows: first .segment except the lateral margins; second 

 with a large T-shaped marking ; third with a large central triangle, laterally pro- 

 tracted to the lateral margin ; fourth similar, except that the central area is 

 larger and more quadrate; anterior half of the fifth with a large central spot, 

 the lateral projections not quite reaching the margins; in other specimens the 

 markings on the third segment are keystone- or anvil-shaped, and contains two 

 small greenish spots. 



Lo.s ilngeles County, California (Coquillett) ; Utah (Aldrich ; 

 Denver, Col. (E. V. Beales) ; Texas (T. E. Hood, Boston, Soc. Nat. 

 Hist.) ; Wallace County, Kansas (F. H. Snow) ; Lincoln, Neb., 

 July (Univ. Neb.); Algonquin, 111. (Dr. W. A. Nason ) ; Elkhart, 

 Ind. (J. R. Weith) ; Constantine, Mich. (U. S. Nat. Mus.). 



An O, megacephala was described by Olivier (Ency. Meth. 432, 

 viii ) from Egypt ; I therefore adopt the second name given by Loew. 



Odoiitoinyia varipes Loew. 



Odontomi/iK varipe.i Loew, Centur. vi, 21; Day, Proc. Acad. Nat. Sci. Phila. 



1882, 84. 

 Length %, 12 ram. — Face green, vertical triangle black, ocelli yellowish, ver- 

 tical angles green, frontal triangle minute, black ; first two joints of the antenna? 

 cylindrical, equal, reddish (third joint in ^the type specimen wanting) ; proboscis 

 light yellow, labelli black. Thorax black, yellow pile ; pleurae, ])osterior angles 

 and scutellum green ; base of the latter with a triangular black spot, spines short, 

 pectus black. Abdomen green, with an irregular doi-sal stripe of black having 

 the following characteristics on each segment: first except the posterior angles : 

 second keystone-shaped, widest at the anterior margin ; third somewhat wider 

 than the second, slightly contracted in the middle, and attenuated along the an- 

 terior margin to the sides; fourth similar but slightly wider: fifth except a nar- 

 row lateral and posterior margin; venter wholly green. Femo7-a yellow, outer 

 half of the anterior, outer third of the middle and tip of the posterior femoj-a, 

 reddish; base of the tibiae yellow: outer half of the tibiae and tarsi reddish, 

 brownish black at the extremities. Wings pure hyaline, veins yellow ; third 

 longitudinal vein forked, discal cell emits three equal veins. 



Carolina (Loew). 



The above description is based on the type specimen. The (original 

 descri])tion, describing the abdomen black with green markings, I 

 have reversed, as this belongs to the group in which green predomi- 

 nates. It is closely related to Odontoinyla blnofata, but the head is 

 smaller, the spines of the scutellinn much shorter and blunt, legs 

 darker, and the abdominal markings much different that the male 

 of that species. 



