AMERICAN ENTOMOLOGY. 145 



Mystax, in some Diptera, is a patch of bristles or hair, imme- 

 diately above the mouth, on the lower part of the hypostoma, 

 below the vibrissas. 



N. 



Naked, (pupa) not foUiculated ; (surface) glabrous. 



Nasus, the anterior termination of the face, particularly in Hv- 

 menoptera, often separated from the front by a suture, and 

 often elevated, sometimes gibbous ; it is very obvious in Vespa 

 and the kindred genera ; it has no relation with the organs of 

 smelling ; it supports the labrum. 



Nail, the unguis. 



Natatory, (feet) formed for swimming. See cursory, saltatory. 



Navicular, boat-shaped ; with a concave disk and elevated mar- 

 gin ; cymbiform. 



Nebulous, clouded ; marked with many scattered, abrupt, dilated 

 lines of various forms. 



Neck, a contracted posterior termination of the head in some in- 

 sects. 



Nervures, nerves or vein-like processes which support the mem- 

 braneous part of the wings; divided into radial, cubital, bra- 

 chial and recurrent- 



Neuroptera, an order of insects, including such as have four 

 finely reticulated wings and no sting, as Dragon-flies, May- 

 flies, &c. 



Niger, black, a little tinged with gray. 



Nitidus, nearly synonymous with lucid, but is less brilliant, and 

 is applied to highly polished surfaces. 



Nutant, nodding ; the tip bent down towards the horizon. 



Nymph, the second state of an insect, from the egg, the members 

 of which are free, or not enclosed with a common integument, 

 as in Grillus. See chrysalis, aurelia, pupa. 



0. 



Ob, perfixed to a word generally signifies inversely. 



Obconir, inversely conic; conic with the vertex pointing down- 

 ward. 



Obcordate, inversely heart-shaped ; heart-shaped with the point 

 applied to the base of another object or part. 



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