PERLA. 29 



32. P. clymene. 



Chloroperla clymene Newm. Mag. Nat. Hist. 2d ser. Ill, 87, 4. Pict. 

 Perl. 283, 4. Walk. Catal. 167, 87. 



" Head yellow, eyes and ocelli black ; wings lightly tinged with 

 fuscous, nervures all fuscous." Newman. 



Alar expanse 26 millira. 



Hob. Georgia (Abbot). Unknown to me. Does it belong here ? 



Subgenus Chloroperla Pictet. (Costal, apical space with one 

 transverse vein.) 



33. P. Guerinii. 



Perla Guerinii Pict. Perl. 279, 55 ; tab. xxx, fig. 68. Walk. Catal. 

 164, 77. 



Black ; head as wide as the prothorax, black, a stripe upon the 

 occiput yellow ; prothorax quadrangular, anteriorly narrower, 

 rugulose, a stripe upon the middle yellow ; feet brown, femora and 

 tibiaB with a longitudinal line, and tarsi, black ; abdomen black, 

 the last segment whitish-gray ; seta3 fuscous, pilose, base whitish ; 

 wings dusky subhyaline, veins dusky. (From the figure and de- 

 scription of Pictet.) 



Length to tip of wings 15 millim. Alar expanse 27 millim. 



Hal New Orleans. Unknown to me. 



34. P. maculata. 



Perla maculata Pict. Perl. 280, 56; tab. xxx, fig. 9. Walker, Catal. 

 164, 78. 



Black ; head as wide as the prothorax, yellow, disk broadly black ; 

 prothorax black, with a yellow middle line, posteriorly narrower, 

 sides rounded ; wings dusky, costal space obscurer, veins black. 

 (From the figure and description of Pictet.) 



Length to tip of wings 11 millim. Alar expanse 20 millim. 



Hob. Philadelphia. Unknown to me. 



35. P. decolorata? 



Perla decolorata Walker, Catal. 170, 98. 



Pale testaceous; head a little broader than the prothorax, pale 

 testaceous, with an irregular, discoidal, black spot ; prothorax 

 quadrangular, subrugose, a large fuscous spot each side, sides 

 straight, angles subacute ; wings hyaline, veins black, testaceous 

 at base. (From the description of Mr. Walker.) 



