PERLA. 27 



Length to tip of wings 22 raillim. Alar expanse 29 — 38 millim. 

 Hab. Mexico ; Brazil. Unknown to me. 



27. P. costalis. 



Perla costalis Pict. Perl. 264, 48 ; tab. xxiv, fig. 4. Walk. Catal. 162, 70. 



Fuscous ; head broader than the prothorax, fuscous, in front 

 rufescent; antennae black; prothorax quadrangular, black, middle 

 reddish-rugulose, angles rounded, behind narrower ; abdomen 

 yellowish-fuscous ; the setae fuscous, at base luteous ; feet yellow- 

 ish, apex of the femora, tarsi, black, tibiae exteriorly fuscous ; 

 wings fuscous, veins black, costal one golden-yellow. (Taken from 

 the figure and description of Pictet.) 



Length to tip of wings ? 18 millim. Alar expanse 2? millim. 



Hab. Vera Cruz. Unknown to me. 



28. P. occipitalis! 



Perla occipitalis Pict. Perl. 254, 43 ; tab. xxvi, fig. 1 — 3. Walker, 

 Catal. 160, 65. 



Yellow varied with brown ; head broader than the prothorax, 

 ocelli black, only two in number, surface between the ocelli black- 

 ish-brown, remaining surface yellow, in front clouded with fulvous ; 

 antennae brown, their base luteous, with the basal articulation 

 blackish-fuscous at base, and at its apex luteous ; prothorax brown, 

 rugulose, posteriorly narrower, anteriorly somewhat rounded, sides 

 a little oblique, anterior angles acute ; feet yellow, exteriorly fus- 

 cous ; abdomen and setae yellowish ; 9 antepenultimate ventral 

 segment truncated ; wings testaceo-subhyaline, costal space yel- 

 lowish, veins testaceous ; accessory vein direct. (Female only seen.) 



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



Hab. Philadelphia j New York ; Washington (Osten Sacken) ; 

 Maryland (Uhler). 



Very similar to P. dilaticollis. In the specimen from Maryland 

 the prothorax has a middle yellow stripe, anteriorly and posteriorly 

 broadened. 



29. P. picta. 



Perla picta Pict. Perl. 261, 47 ; tab. xxvii, fig. 3, 8. 



Yellowish-fulvous ; the head broader than the prothorax, lute- 

 ous, a spot upon the middle triangular, and another irregular, 

 between the ocelli black, ocelli three ; antennae yellowish, apex 



