H. C. FALL. 131 



variation aside from size and color of the legs. OMorliyuchiim in 

 some respects resembles certain species of Section I, but the likeness 

 is merely superficial. There is not the least indi(;ation of any of 

 the characters which are peculiar to that group. The intromittent 

 organ of the male is flattened and acuminate at the tip as in the 

 ft)lIovving sections — not cylindrical and rounded as in Section I. 



in. 



The species here included are a little more numerous than the 

 two preceding groups combined. They agree in having the claws 

 plainly, usually strongly toothed at the base (PI. IV, fig. 4), and at 

 least two pairs of tibiae mucronate in the male. In by far the 

 greater number the middle and hind tibia? are thus armed ; in two 

 onlv — opuclcolle and cribrleolle — it is the front and middle tibii^ ; 

 while in six species — fenuiro.s^r«/», cordatioii, ohl'itum, fiirtivuin, coiii- 

 modiun and coiife>ium—al\ three pairs are mucronate. The mucro 

 of the anterior pair when present is always small, and sometimes so 

 minute as to easily escape notice. In a considerable number of spe- 

 cies the mucro of the middle and hind tibiie is subangulate or den- 

 tate beneath. The degree and position of the angulation or denticle 

 seems very constant for each species, and doubtless might, within 

 limits, be used to greater advantage by the careful observer than I 

 have deemed it advisable to do. With but two or three exceptions 

 the species are at least moderately robust, the thorax more or less 

 transverse, wider behind, with a basal fovea ; humeri well develo])ed ; 

 body plainly pubescent. 



The species known to me may be distinguished as follows : 



Prothorax slender; sides nearly parallel -at least in the % ; base but little wider 

 than the apex 1. 



Sides of thorax not parallel ; base usually much wider than the apex. 2. 



L First joint of antennae shorter than the next two; anterior coxae of % not 



tiiberculate. 34. opacicolle. 



First joint of antennje as long as the next two ( % ), or three ( 9 ) ! anterior 

 coxae ( % ) tuberculate at the apex. 35. ooxale. 



2. Prothorax widest before the base; sides not at all sinuate posteriorly. (PI. 



IV. fig. 1) 3. 



Prothorax variable, often with a slight sinuation before the base, which is 



never narrower than the middle. (PI. IV, fig. 2). 4. 



Prothorax with the sides plainly narrowed behind the middle, which is as 



wide or even wider than the base; size large, 2 mm. or more, except 



farHvum. (PI. IV, fig. 3) IL 



3. All the tibiae of the % mucronate; elytral intervals convex. 



3ti. leniiiroMtriiin. 



TRANS. AM. ENT. SOC. XXV. OCTOBER. IStif.. 



