110 NEUROPTERA OP NORTH AMERICA. 



wings flavescent ; pterostigma oblong, yellow ; membranule black ; 

 8 — 9 antecubitals ; 6 — 7 postcubitals ; two discoidal areolets. 



Length 38 millim. Alar expanse 66 millim. Pterostigma 3 

 millim. 



Hal. Cuba (Poey); Minas Geraes, Rio Janeiro, Brazil. 



MESOTHEMIS Hagen. 



Eyes connected in a short space; posterior lobe of the pro- 

 thorax large, broad, bilobed ; abdomen a little shorter than the 

 wings, narrow, triquetral, the base compressed, somewhat broad- 

 ened before the apex ; feet long, rather strong ; the first sector of 

 the triangle sinuated ; the triangle moderate, narrow ; appendages 

 short; genital organs not prominent; vulva obtected; sides of the 

 eighth segment of the female not dilated. 



1. M. simplicicollis ! 



Libellula simplicicollis Say, Journ. Acad. Philad. VIII, 28, 16. Libellula 

 caerulans Ramb. ! Neuropt. 64, 44 (£). Selys ! Poey, Ins. Cuba, 

 448. Libellula maculiventris Ramb.! Neuropt. 87, 78 (9). 



Yellowish-green; mouth and front yellowish, a narrow black 

 band before the eyes ; thorax yellowish-green, the sides inferiorly 

 varied with black; abdomen compressed at base, vesiculose, tri- 

 quetral, a little broader before the apex, yellowish -green, the 

 sutures and margins black, the segments 4 — 10 with a quadran- 

 gular, ' dorsal spot behind, black ; the last segments sometimes 

 altogether black ; venter obscure ; appendages yellow ; feet black, 

 the anterior femora yellowish beneath ; the vulvar lamina erect, 

 triangular, excavated; wings hyaline; pterostigma oblong, yellow; 

 membranule black. 



Adult Male. Thorax and abdomen blue-pruinose. 



11 — 12 antecubitals; 9 — 12 postcubitals; three discoidal areo- 

 lets. 



Length 41 — 45 millim. Alar expanse 60 — 70 millim. Ptero- 

 stigma 3£ — 4 millim. 



Hab. Indiana ; Illinois ; Massachusetts ; Philadelphia ; New 

 York; New Jersey; Savannah; Florida; New Orleans; Pecos 

 River, Texas (Capt. Pope) ; Matamoras, Huastee (Saussure), 

 Mexico; Cuba. 



A common species. 



