230 MONOGRAPHIA 



SUB-GENUS III. NITZSCHIA.* (Denny.) 



Nitzschia, Denny's MS. Menopon, Nitzsch. 

 SUB-GENERIC CHARACTER. 



Head oblong triangular, orbital margin sinuated ; maxillary 

 palpi large and prominent ; antenna capitate, nearly 

 concealed; prothorax narrow; mesothorax large, very 

 distinct ; abdomen oblong ; tarsi with large involute 

 pulvilli. 



1. NITZSCHIA BURMEISTERI. Denny. (Louse of the 

 Common Swift.) 

 Plate XXII. Fig. 5. 



Oblong, wholly of a dark chestnut, smooth and shining; 

 head with a deep concavity in the centre ; mesothorax trans- 

 verse ; abdomen depressed, posterior tibia notched. 



Menopon pulicare. Nitzsch. MSS. 



Head rather small, oblong triangular, lateral margin 

 doubly sinuated on each side, vertex with a deep oblong 

 concavity, occiput produced, with a depressed line on each 

 side extending to the clypeus ; eyes large and prominent ; 

 antennae nearly concealed in the cavity of the temporal 

 margin, capitate, the last joint large and ovate; prothorax 

 much narrower than the head, rotundate quadrate, with a 

 line in the centre ; mesothorax the width of the head, trans-- 

 verse, convex, anteriorly deeply sinuate, posterior margin 

 much produced in the centre, sub-angular; metathorax 

 very large, sub-quadrate, widest behind, centre depressed ; 

 abdomen elongate, clavate, flat, suture of each segment 



* In honour of the late Dr. C. L. Nitzsch, Professor of Natural History, 

 and Director of the Zoological department in the University of Halle, 

 whose labours laid the foundation for a thorough investigation of the Pedi- 

 culidse and Nirmidse. He was a minute and accurate observer of nature, and 

 successful cultivator of several branches of science, but more especially 

 Entomology and Ornithology. He died August l6th, 1838. 



