238 MB. E. m'lachlan on a systematic 



12. H. IMPEDIENS, Walker. (Ascal. impediens. Walk. Cat. Brit. 

 Mus. Neurop. p. 449.) Antennae alarum dimidio pauUo longiores, 

 nigrsej clava infra in medio flava, Frons cervino-fuscoque villosus. 

 Thorax griseus, supra vittis duabus longitudinalibus flavis, infraque 

 vitta utrinque lata flavo-albida, ornatus. Pedes pallide flavidi; fe- 

 moribus, tibiisque extus fuscis ; tarsis nigris. Abdomen fuscum, 

 supra utrinque flavido-vittatum. Alae breves, latse (posticse basin 

 versus valde dilatatae), vitreae, pernitidae, venuste irideseentes ; venis 

 venulisque nigris ; pterostigmate pallide flavo, nigro-venato. Long. 

 Corp. 13"'; exp. alar, antic. 33'", postic. 29"'. 



Hub. Para {Bates). 



13. H. iMMACULATus, OHvier. (Ascal. iramaculatus, Oliv. Encyc. 

 MSthod. iii. p. 246.) 



Hab, South America. 



Olivier certainly had a species of Saploglenms before him 

 when he wrote his description ; hut it is impossible to identify it. 

 His remark tliat " Les ailes de cet insecte lui donnent un peu 

 I'air d'une libellule," has more significance tlian he probably 

 intended, when the position of the wings in repose is taken into 

 consideration. 



v' Genus Pttnx, Lefehvre. 

 (Haploglenius, Rami, nee J3urm.) 



Wings elongate, narrow, the two pairs nearly equal in length, 

 the posterior pair somewhat narrower ; the basal portion longly 

 excised on the inner margin, and very narrow : anterior pair 

 appendiculate ; posterior pair with a slight dilatation at the 

 extreme base of the inner margin : network very close ; the 

 neuration furnished with strong hairs ; and there are also 

 strong but short hairs on the membrane of the cellules, espe- 

 cially in the apical portion. 



Antennae short, scarcely more than half the length of the wings, 

 robust ; club short and broad. 



Thorax hairy. 



Abdomen slender in the S , acuminate, hairy, with a pair of very 

 short, somewhat spoon-shaped, semicircular terminal appen- 

 dices : more obese and shorter in the $ . 



Legs with the spurs of the posterior tibiae nearly equalling the 

 first three tarsal joints. 



Hab. Southern United States. 



Lefebvre refers costatus of Burmeister to this genus as the 

 type ; but I believe he misunderstood Burmeister's insect. 



