ETJEYTOHID.E. 15 



abdomen glabram, fusiforme, tborace multo brevius et angustius ; 

 genua fulva ; tarsi picei ; alas subfuliginosae, piceo venose. 



Male. Black, slender. Head and tborax finely punctured. 

 Antennae a little snorter than tbe body; third and following joints 

 long, nearly linear. Prothorax with two piceous humeral spots. 

 Abdomen fusiform, much shorter and narrower than the thorax. 

 Knees tawny ; tarsi piceous. Wings slightly smoky ; veins piceous ; 

 ulna much more than half the length of the humerus ; cubitus longer 

 tban the radius, about one-fourth of the length of the ulna. Length 

 of the body lj line. 



The more moniliform antennae and the darker tarsi distinguish it 

 from I. verticillata. 



England. 



I. cxaktpennis. — Mas. Nigra, subtiliter punctata ; antennae 

 thorace multo longiores, articulis fusiformibus petiolatis ; prothorax 

 fulvo bimaculatus ; abdomen glabrum, fusiforme, thorace multo 

 brevius ; genua fulva ; tarsi nigri ; alas albae, piceo venosae. 



Male. Black. Head and thorax finely punctured. Head broader 

 than the thorax. Antennae much longer than the thorax ; joints 

 from the fourth to the eighth fusiform, with long whorls of hairs and 

 with rather long petioles ; third joint much longer and stouter than 

 the fourth. Prothorax with two tawny humeral spots. Abdomen 

 fusiform, much shorter than the thorax. Knees tawny ; tarsi black. 

 Wings white ; veins piceous ; ulna much shorter than the humerus ; 

 cubitus longer than the radius, about one-fourth of the length of the 

 ulna. Length of the body ] i line. 



It may be distinguished from I. petiolata by the smaller humeral 

 spots, by the shorter petiole, and by the darker tarsi. 



England. 



I. tenuipes. — Mas. Nigra, gracillima, subtilissime punctata; 

 antennae gracillimae, thorace longiores ; prothorax testaceo bimacu- 

 latus ; petiolus longiusculus ; abdomen glabrum, subdepressum, 

 postice latescens, thorace multo brevius ; pedes gracillimi, femoribus 

 apice tibiis basi tarsisque testaceis ; alae diaphanae, piceo venosae. 



Male. Black, very slender. Head and thorax very finely punc- 

 tured. Head a little broader than the thorax. Antennae very 

 slender, longer than the thorax; joints long. Prothorax with 

 two testaceous humeral spots. Metathorax attenuated. Petiole 

 rather long. Abdomen rather flat, much shorter than the thorax, 

 gradually increasing in breadth from the base nearly to the tip. 

 Femora at the tips, tibiae at the base and tarsi testaceous. Wings 

 pellucid ; veins piceous ; ulna a little more than half the length of 



