114 THE CANADIAN ENTOMOLOGIST. 



beneath, a large spot on mesopleura just above the mesosternal suture, 

 spot at base of hind wings, the blunt but prominent metathoracic tubercles 

 and rather broad bands at apex of all abdominal segments, white. Head 

 sparsely punctate ; thorax punctate, the mesonotum medially somewhat 

 rugoso-punctate, laterally more evenly and less closely punctate, the 

 mesopleura medially with some coarse transverse striae, just back of which 

 is a smooth polished spot, but above and below closely punctate ; meta- 

 thorax with only the basal transverse carina present and which is sinuate 

 medially, the basal enclosure thus formed finely rugulose, but beyond it 

 the surface is rather coarsely rugose ; the white metathoracic tubercles are 

 short, blunt and wider or longer than high. Wings hyaline, the stigma 

 lanceolate, brownish, the other veins black ; areolet quadrate in position 

 but open behind. Abdomen shining, but under a strong lens exhibiting 

 a very fine coriaceous punctuation. 



^. — Length, 7 mm. Agrees well with the female, except the face 

 below the antennre, including the semicircular labrum, is entirely white, 

 the mandibles with a white spot at base, the antennae entirely black, not 

 ringed with white, 29-jointed, the front cox^ and trochanters whitish, 

 while the hind tibiae, except near base, their spurs and their tarsi, are 

 black. Type, No. 3649, U. S. N. M. 



Described from one male and three female specimens. 



The two previous species known in our fauna were described by the 

 writer and from the male sex only. The ma/es of these three species may 

 be tabulated as follows : 



A. Head and thorax with rufous markings. 



Legs rufous ; hind tibins, except at base, and their tarsi, black ; 

 tibial spurs red (Texas) (i ) C. fexauus, Ashm. 



AA. Head and thorax with white markings. 



Legs rufous, the coxae white with black markings ; second joint 

 of hind trochanters, tips of hind femora, apical two-thirds 

 of their tibiae, black; their tarsi, except extreme base of first 

 joint and more or less of the last joint, which are black, 

 white (Michigan) (2) C. albomaculatus, Ashm. 



Legs fulvous, anterior coxag and trochanters white, hind tibiae, 

 except at base, their spurs and tarsi, entirely black, their 

 femora not tipped with black (3) C. Dyari, Ashm. 



