2fi0 CHARLES W. JOHNSON. 



joints of the tarsi brownish. Winsjs hyalin(>. veins yeUow ; tliird h)nKitudiTi;(l 

 veins simple, discal cell emits three stronji veins. 



•J, . — Fa(^e and base of the vertical triangle yellovpish ; vertical triangle black. 

 Thorax black ; lateral stri])e (obsolete near the humeri), pleurge and scutelluni 

 yellowish ; base of the scntelhim brown. 



Ten fspeciiueiis ; Bird's Island, near Astor, Fla., May 11 ; St. 

 Angu.stine, Fla. (F. H. Gcuning) ; Colorado (collection C. V. Riley, 

 U. S. Nat. Mas.) ; City of Mexico (Salle) ; Cuantle, Mex. (de Raus- 

 sure) ; Guatemala (Champion). 



The specimen ( S ) from Texas has the abilomen greatly discolored 

 (brownish). Most of the specimens before me have been collected 

 for some time, and are greenish yellow, but a specimen ( 9 ) recently 

 collected near Astor, Fla., is bright green. A specimen ( % ) re- 

 cently taken bv Mrs. Slosson at Ormond, Fla., the abdomen is bright 

 green. 



Odoiitoiiiyia vertebrata Say (PI. iv, figs. 26, 27, 28). 



Odontomyia vertebrata Say, Long's Exped. App. 369 ; C'ompl. Wr. 251 ; Wiede- 

 mann, Auss. Zw. ii, 73. 20; Bellardi, Saggio, etc., i, 38; Day, Proc. 

 Acad. Nat. Sci. Phila. 1882, 85. 

 f^truHomi/.s vertebrata Walker, List, etc., v, 39. 

 Odontomyia WiUistoni Day, Proc. Acad. Nat. Sci. Phila. 1882, 78, 9 . 



Length % 8 mm. — Face brownish ; cheeks and oral margins black, facial promi- 

 nence red. Antennaj brown, base and tip black ; ocellar triangle black. Thorax 

 black, with whitish pubescence ; posterior angle and scutelliim red, base black, 

 spines light green. Abdomen yellowish white, with a variable dorsal line of 

 black, extending to the anterior part of the fifth segment; in some this line re- 

 sembles that of 0. plebeja, but with edges more irregular, in others the line on 

 the second and third segments is narrow, and of a browni.sh color, while in others 

 it is broadly interrupted, the markings on the second and third segments con- 

 sisting only of a spot at the anterior margins; the size of the roundish marking 

 on the fourth segment is quite constant; venter yellowish white. Legs yellow. 

 Wings hyaline, veins light yellow, discal cell emits three veins, third longitudinal 

 vein simple. 



Length 9 9mm. — Face smooth, shining: front and vertex rugose; face and 

 front bearing two or three colors ; green with yellow and brownish black mark- 

 iugs, or a uniform yellow with the brownish black markings: the latter are ar- 

 ranged as follows: a spot more or less prominent on each side of the oral margin : 

 a spot on each side of the facial prominence, a transverse line above the antennse 

 not reaching the eyes ; an irregular transverse line across the front and vertex, 

 the ends of the latter sometimes curved downward and connecting with the 

 former; they are sometimes also connected by a central longitudinal line extend- 

 ing from the ocelli, giving the front a reticulated appearance; occiput green, or 

 greenish yellow. Antennse black, second joint brown. Thorax black, with short 

 golden pubescence, forming in certain lights two dorsal stripes ; humeri green, a 

 green lateral stripe commences just before the suture and extends to the base of 

 the scutellum ; this stripe contains a small i)lack spot above the base of the wing ; 



