230 ME. B. m'lachlan ok 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 "JVows" I mean the vertical face of the head ; " Vertex'' 

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

 antenn£e to the posterior margin ; " Occiput " refers to the back 

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

 English lines (12'" = 25 millimetres). 



Tabula Generum, 



Div. I. HOLOPIITirALMI. i 



(Oculi intogri.) 



A. Alas anticsD ad basin appendiculataj. 

 a. AntenniB alis multo breviores. 



6. Alae anticje posticajque ad basin pei'angustata), iude sat 

 lats3, dense reticulata ^Ptynx, Lefebv. 



hb. AloD anticso ad basin paullo augustata), aperte reticulata), 

 (vide infra) '^ Haploglenius, Burm. 



III. Al£e perangustatiE .... -^ Melambrotus, n. g. 



aa. Antenna3 alis sequales vel longiores. Alse variegatse, ad 

 basin angustatse, inde dilatatse. . ^ Tmesibasis, n. g. 



B. Alse anticaj baud appeudiculata). 



c. AlsB, insecto baud volitante, fere liorizontaliter extensie. 

 Prothorax maris supra in valvulam magnam postice pro- 

 ductus. Abdomen suhgracile.^ Haploglenius, Burm. 

 cc. Al^, insecto baud volitante, longitudinaliter deflexaj. 

 Protliorax maris simplex, 

 d. Alse latse. Corpus valde robustum, breve. 



^ Cormodes, u. g. 

 dd. Ala) angustiores. Corpus gracilius, long! us. 



•^Idricerus, u. g. 



Div. II. SoHizopnruALMi. v 

 (Oculi divisi.) 

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

 costa elongata, sinuata. (Genera Americana.) 

 a. Als& anticse ad basin appendiculatse ; posticaa maris prope 

 basin valde dilatatse. Antenna) alis lequales vel longiores. 



•^Orphne, Lefebv. 



