490 HALIDAY ON 



sequentibus etiam) hyalinae nervis fuscis, stigmate dilute ])iceo 

 (in vivis lutescente), radice et squamulis piceis : pedes fulvo- 

 ferruginei, posteriorum femora supra, tibiae medio, tarsi apice 

 infuscati : coxae posticae fuscae : abdomen lineari-lanceolatiim 

 fuscum aculeo concolore, basi media et petiolo dilutius : valvida 

 ventralis et cornua lutescunt : petiolus gracilis utrinque bidentatus 

 medio infuscatus. 

 Hah. inter Aphidis Amjclicce sylvestris autumno parum frequens. — 

 (Mns. S'oe. Ent.) 



Sp. 15. A. T. Centaurese. Pedibus anticis et genicidis liites- 

 cetitibus: {antennis feminae W-artictilatis Jiliformibus, 

 petiolo pone medium tuber cidato.^ (Long. 11.; alar. .19.) 



Fern, — Caput et thorax nigra : antennae graciles nigrae, breviore, 

 quam in A. aucto : palpi picei : pedes antici lutescenti-ferruginei, 

 postici picei trochanteribus et basi tibiarum ferrugineis : abdomen 

 lineari-lanceolatum nigro-piceum, segmenti secundi medio palles- 

 cente : petiolus gracilis inter medium et apicem denticulatus. 



Hah. in Aphidibus Centaurece nigrce minus frequens.^ 



Sp. 16. A. T. Aceris. Pedibus anticis et geniculis abdo)ni- 

 nisque basi et aj^ice luteis : {antennis feminae \\~articulatis 

 longiusculis apice crassioribus, petiolo ante medium tiiber- 

 culato.) (Long. .12; alar. .21.) 



Aphidius Cirsii. Curt. B. E. 383. 



Fern. — Caput nigrum, os lutescens : antennae multo longiores quam 

 in sequentibus, sensim incrassatae articulo ultimo magno 

 oblongo : thorax niger : pedes lutei, posteriorum femora, tibiae 

 medio, tarsi apice, fuscescentes aut picei : coxae posticae fuscae : 

 abdomen dorso fuscum postice lutescens fere croceum : petiolus 

 sordide luteus, ante medium denticulatus. 



Prodiit mihi ex Aphidibus Aceris Pseudoplatani Julio mense. 



Sp. 17. A. T. Heraclei. Hypostomate antennis basi, pedibus 

 anticis et geniculis, abdoministpie basi et apice luteis : 

 {antennis feminae W-articulatis brevibus apice crassioribus, 

 petiolo bituberculato.) (Long. .09; alar. .17.) 



Fern. — Caput nigrum, facie tota sub antennis et ore luteis : antennae 



^ I have observed this species attacking the pucerons of the Centaury ; its 

 pi-oceedings are similar to those of the true Aphidii (see the note under A. Roscb, 

 Sp. 27) : it pierces the under side of the puceron, and by an equally in- 

 stantaneous touch; nor could I perceive that the singular anal horns serve any 

 purpose in this operation. 



