ACANTHACLISIS. 223 



lone;, the apex elliptical; veins and their fimbrice pale yellow; base 

 of the costal veins, the first and second sector, some of the cubital 

 at the apex and sometimes at the base, and the gradate veins (12 

 and 10) all black. 



Length to tip of wings 23 millim. Alar expanse 41 millim. 



Hob. Mexico (Deppe; Berlin Museum). 



ACANTHACLISIS RAMBUR. 



Antennas short, stout, the apex thickened ; labial palpi longer 

 than the maxillary; body stout, abdomen long, the apex forcipated 

 in the males; feet stout; spurs infracted; base of the nails dilated; 

 wings long, narrow, densely veined; the male having a tubercle at 

 base of posterior wings. 



1. A. americana. 



Myrmcleon americanum Drury, Ins. 1.111,4; tab. slvi, fig. 4. Burin. 

 Handb. II, 996, 17. Walk. Catal. 317, 31. Acanthaclisis americana 

 Ramb. Neuropt. 380, 4. 



Gray, clothed with gray hairs ; head with a black stripe in the 

 middle, face gray; antennas black; thorax yellow-gray, with a stripe 

 in the middle and a lateral one each side black, clothed with long 

 gray pile; abdomen fuscous, the sides obscurer; apex of the abdo- 

 men of the male with short, straight, forcipated cerci ; feet black, 

 with gray hair ;' wings grayish-hyaline, densely pointed with fus- 

 cous; costal space fuscescent in the middle, biareolate. (From the 

 figure and description of Drury.) 



" Grayish-fuscous, front and two dorsal stripes rosy-gray; feet 

 annulated with flesh-color; veins of the wings hyaline, alternately 

 rosy and fuscous, wings with fuscous and pearly spots." (Burm.) 



Length to tip of wings tl millim. Alar expanse 126 millim. 



Hal). New York (Drury) J*; South Carolina (Zimmerman) 9. 



I have never seen it ; the specimen of Burmeister is larger, the 

 wings spread 96 millim. Is it different? 



2. A. fallax! 



Myrmdeon fallax Ramb. ! Neuropt. 385, 1. Walk. Catal. 329, 45. Mijr- 

 melcon impostor Walk.! Catal. 324, 41. Myrmeleon senilis Klug! Ber- 

 lin Museum. 



Lurid, with gray villosity, beneath yellowish ; face, palpi, and 



