10. 



NOTONECTA MACULATA. 



Spotted Boatfly. 



Order Hemiptera. Fam. Notonectidae Leach. 



Type of the Genus Notonecta glauca Linn. 



NoTONECTA Linn., Geoff., Fab., Lat. 



Antennce concealed in a cavity behind the eyes, minute, 4-joint- 



ed ; first joint very small, globose ; second large, somewhat cy- 



lindric ; third as long as the second, but much more slender j 



fourth very small, conical. (4. 4.) 



Labrum exserted, large, triangular, convex : apex terminated 



rather abruptly. (3. 3.) 



Rostrum as long as the head, inflected, arcuated, conical, 4-joint- 



ed ; first triangular, truncated ; second with a tuft of hair on each 



side beneath ; third equal in length to the first and second ; 



fourth small, bifid. (2. 2.) 



Mandibles passing through the rostrum, like setae, acute. 



Maxilla; passing through the rostrum, like setae, acute, not so 



long as the mandibles. 

 Head vertical, transverse, as wide as anterior margin of thorax, rounded 

 before; eyes large, oblong, converging above, external margin sinu- 

 ated (l.)j Thonix hexagonal, ci/Undric, narrowed before. Scutellum 

 large, triangular. Abdomen long, oval, thick, flat beneath, termi- 

 nated on the side by a small ciliated process. Elytra notched at the 

 apex. Tarsi 2-jointed, the first articulation the longest, the 4 ante- 

 rior feet with strong claws ; the hinder pair elongate, strongly ciliated, 

 and with very minute claws. (6.) 



N. MACULATA Fab. Eut. Syst. v. 4. p. 58. Coquebert's Illus. bis. 

 tab. 10. f. 1. 



Thorax and head pale cinereous : scutellum black : abdomen 

 bright orange, black round the scutellum, and a very dark broad 

 spot in the centre J the apex of abdomen on each side green. 

 Elytra ferruginous, sj)otted irregularly with deep brown, anterior 

 margin pale; wings very transparent, tinged with j)ink and yel- 

 low J legs dull and pale green. 



In the Cabinets of Mr. Dale and the Author. 



The genus Notonecta contains three species, diflerinn; only in 

 colour and markings, A'^ <^lanca Linn., N. furcata Fab., and 

 N.macidata. The first inhabits almost every pond; the seconil 

 is more local, but may be found plentifully about London, and 

 other parts of the kingdom; thelast appears to be confined to 



