THE CANADIAN ENTOMOLOGIST. 175 



A comparison of my female specimens with the description of 

 interrogatum shows conclusively that they belong to this species, 

 for the description, as far as it goes, is quite detailed, and the 

 colour-pattern distinct enough to be unmistakable. As this 

 description, however, was based upon an imperfect specimen, 

 and as the male was hitherto unknown, I have prepared the fol- 

 lowing descriptions ofboth sexes. 



Male — Face, including anterior margin of frons to base of 

 antennae, greenish; postclypeus and a heavy line at base of labrum 

 black; postocular spots bluish, of moderate size, pyriform or sub- 

 triangular, the inner angles acute; a narrow blue occipital margin, 

 which may be interrupted; underside of head black, with a rather 

 broad, yellow, ocular margin; basal part of maxillae piceous, labium 

 pale yellowish. 



Prothorax black, margined in front and behind with bluish, 

 pleura with 3 or 4 irregular blue spots just above the fore-coxae; 

 hind margin broadly curved or subobtusangulate, moderately 

 elevated except at the median line. Thorax bronze-black with 

 azure blue markings. Antehumeral bands divided into an anterior, 

 stripe and a posterior spot, the former slightly incurved in front, 

 broader in the middle than half the mid-dorsal black stripe, 

 the anterior ends truncate and slightly expanded, posterior ends 

 abruptly rounded; the posterior spot rounded or oblong. Sides 

 of thorax with a blue spot above each coxa and two large blue 

 areas separated at the second suture by a heavy black line which 

 is widened just behind the stigma and again at the upper end. 

 The anterior blue area is partly divided above by a short black 

 line, is excavated antero-ventrally and has three postero-ventral 

 concavities, the middle and upper ones corresponding to the 

 expansions of the black sutural line. Venter pale bluish, the 

 sutures and the space between the middle and posterior legs 

 heavily marked with black, and a heavy black band behind the 

 posterior legs continuous caudad with the stem of a median Y- 

 shaped spot. Legs bronze-black, the inner half of the femora 

 and the outer half of the tibiae pale greenish. 



Abdomen bronze-black, marked with azure-blue, as follows: 



Segment 1 blue, dorsum with a transverse black spot oc- 

 cupying the basal third or two-fifths, narrowly continuous on the 



