230 MR. R. m'lachlan on a systematic 



females the abdomen often shrinks to a less size than that of the 

 male, although before oviposition commenced it was of enormous 

 bulk. 



I would here explain that in the diagnoses that follow, by the 

 term " Frons " I mean the vertical face of the head ; " Vertex" 

 includes the whole upper surface of the head from the base of the 

 antennae to the posterior margin ; " Occiput " refers to the back 

 portion of the head behind the eyes. The measurements are in 

 English lines (12"' = 25 millimetres). 



Tabula Generurn, 



Div. I. HOLOPHTIIALMI. 



(Oculi integri.) 



A. Alae anticse ad basin appendiculatae. 

 a. Antennae alis multo breviores. 



b. Alae anticae posticaeque ad basin perangustatae, inde sat 

 latae, dense reticulatae Ptynx, Lefebv. 



bb. Alae anticae ad basin paullo angustatae, aperte reticulatae, 

 (vide infra) Haploglenius, Burm. 



bbb. Alae perangustatae . . Melanibrotus, n. g. 



aa. Antennae alis aequales vel longiores. Alae variegatae, ad 

 basin angustatae, inde dilatatae . . Tmesibasis, n. g. 



B. Alae anticae haud appendiculatae. 



c. Alae, insecto haud volitante, fere horizontaliter extensae. 



Prothorax maris supra in valvulam magnam postice pro- 

 ductus. Abdomen subgracile. Haploglenius, Burm. 

 cc. Alae, insecto haud volitante, longitudinaliter deflexae. 

 Prothorax maris simplex. 

 d. Alae latae. Corpus valde robustum, breve. 



Cor modes, n. g. 



dd. Alae angustiores. Corpus gracilius, longius. 



Idricerus, n. g. 



Div. II. SCHIZOPHTHALMI. 



(Oculi divisi.) 



A. Bamulus obliquus cubiti inferioris in alis posticis deest ; post- 

 costa elongata, sinuata. (Grenera Americana.) 

 a. Alae anticse ad basin appendiculatae ; posticae maris prope 

 basin valde dilatatae. Antennae alis aequales vel longiores. 



Orphne, Lefebv. 



