238 



MR. R. m'lACHLAN ON A SYSTEMATIC 



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

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

 nigrae ; clava infra in medio flava. Frons cervino-fuscoque villosus. 

 Thorax griseus, supra vittis duabus longitudinalibus flavis, infraque 

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

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

 supra utrinque flavido-vittatum. Alee breves, latse (posticae basin 

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

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

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



Hab. Para (Bates). 



13. H. immaculatus, Olivier. (Ascal. immaculatus, Oliv. Encyc. 

 Method, iii. p. 246.) 



Hab. South America. 



Olivier certainly had a species of Haploglenius before him 

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

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

 Fair d'une libellule," has more significance than he probably 

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

 consideration. 



Genus Ptynx, Lefebvre. 

 (Haploglenius, JRamb. nec Burm.) 



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. 



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

 robust ; club short and broad. 



Thorax hairy. 



Abdomen slender in the d , acuminate, hairy, with a pair of ver} r 

 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. 



Sab. Southern United States. 



Lefebvre refers costatus of Burmeister to this genus as the 

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



