64 NEUROI'TERA OF NORTH AMERICA. 



Length 117 — 124 millira. Alar expanse 126 — 132 millira. 

 Hah. Mexico (Saussure); Vera Cruz (Salle); Columbia. 



2. P. aberrans ! 



Pseudostigma aberrans Seljs ! 



Black, beneath j'cllow ; labrum with a yellow middle spot, front 

 anteriorly yellow, banded with black, and transverse ; prothorax 

 broadly emarginate posteriorly ; thorax black, a humeral yellow, 

 hardly cleft, line ; sides with a black stripe ; pectus with a black 

 stripe in the middle ; feet black, tibias exteriorly yellow ; abdomen 

 black, beneath yellow ; margin of the valves (?) dentated ; wings 

 hyaline, with a large, oval, apical spot; pterostigma absent (9). 



Length 112 millim. Alar exi)anse 131 millim. 



Ilab. Vera Cruz, Mexico (Salle). 



MECISTOGASTER RAiiBtiE. 



Wings narrow; reticulation of the posterior margin simple; 

 postcostal space having a single series of areoles ; pterostigma 

 irregular; abdomen extremely long. 



1, M. modestus ! 



Mecistogastur modestus Selys ! 



Black, beneath yellowish ; labrum yellow, banded with black ; 

 front yellow anteriorly ; prothorax rounded posteriorly ; thorax 

 black, a humeral broad, yellow, obliquely divided stripe; sides 

 with a black, oblique, entire stripe ; feet black, femora exteriorly 

 and base of the tibiae yellowish ; wings hyaline, pterostigma ob- 

 long, black, in younger individuals it is whitish (J"). 



Length 84 millim. Alar expanse 84 — 91 millim. 



Hah. Mexico (Saussure). 



2. M. ornatus ! 



Alecistogaster ornatus Rambnr ! Neuropt. 288, 12. 



Brassy-fuscous, beneath yellowish ; head orange in front, base 

 of the antenna^ orange ; prothorax rounded posteriorly ; thorax 

 brassy fuscous, a humeral divided stripe, a lateral stripe and a 

 short mark near the wings, interrupted, yellow ; pectus with a 

 middle black stripe ; feet fuscous, tibite exteriorly yellowish ; ab- 

 dominal appendages forcii)ated, yellow, at the apex black ; wings 



