184 NEUROPTERA Oi' NORTH AMERICA. 



Length 21 — 26 millim. Alar expanse 34 — 46 millim. Ptero- 

 stigma 1-J — 2 millim. 



Hah. Kentucky; Georgia; Florida; Brazil. 



19, D. credula ! 



Diplax credula Hagen ! 



Fuscous ; mouth luteous, front rufo-fuscous above ; dorsum of 

 the thorax fuscous, a luteous stripe upon the middle; sides luteous; 

 feet brownish-black, base of the femora luteous ; abdomen rather 

 long, triquetral, the base compressed, inflated, nigro-fuscous, sub- 

 pruinose, with the base fuscous (male), or luteous, with the dorsal 

 middle fuscous, and the incisures nigro-fuscous (female) ; vulvar 

 lamina triangular, excavated ; wings hyaline, the extreme base of 

 the posterior ones fulvescent ; pterostigma larger, yellow ; mem- 

 branule black; twelve antecubitals; ten postcubitals; three dis- 

 coidal areolets. 



Length 38 millim. Alar expanse 62 millim. Pterostigma 4 

 millim. 



Hah. Island of St. Thomas; Minas Geraes, Brazil. 



20. D. abjecta ! 



Libellula abjecta Ramb.! Neuropt. 83, 73. 



Brownish-black ; mouth fuscous, front chalybeous above ; thorax 

 nigro-fuscous ; feet black ; abdomen slender, triquetral, the base 

 hardly inflated, nigro-fuscous, pruinose; appendages fuscous; vul- 

 var lamina triangular, erect, excavated; wings hyaline, the ex- 

 treme base of the posterior ones fuscous ; pterostigma large, 

 yellow ; membranule black ; eleven antecubitals ; seven post- 

 cubitals ; three discoidal areolets. 



Length 38 millim. Alar expanse 58 millim. Pterostigma 3J 

 millim. 



Hah. Cuba ; Venezuela ; Brazil. 



In specimens from Cuba, the basal spot of the posterior wings 

 is wanting, or almost wanting, but they are not different. D. 

 ahjecta is similar to the preceding species, but the posterior lobe 

 of the prothorax is small : does it belong to this genus ? It may 

 be an Erythemis? 



