148 THE ENTOMOLOGIST. 



a band when the insect is seen from above, as it does in frater and 

 belfragei', this area of light hair is gently concave behind, and is con- 

 siderably narrowed laterally. 



Hah. Trout Spring, Gallinas Caiion, New Mexico, May 24th 

 (Cockerell). It visits the flowers of Iris missouriensis. Evidently 

 the New Mexico representative of S. edwardsii, Cresson.. 



Synhalonia speciosa (Cresson). 

 $ . Length about 14 mm. ; black, with dull white pubescence, 

 tinged with ochreous on thorax above ; facial quadrangle longer than 

 broad ; clypeus bright lemon-yellow, the yellow notched deeply on 

 each side above ; labrum pale yellow ; mandibles black, with the apical 

 part reddish, and furnished below with a number of shining red hairs ; 

 maxillary palpi 6-jointed, the second and third joints long and about 

 equal, the last three together about as long as the third, and succes- 

 sively smaller, the last being narrow and minute ; antenna? reaching 

 to base of abdomen, entirely black, apical part of flagellum crenulated, 

 and obscurely longitudinally ridged above ; scape short and broad ; 

 third joint about one-third length of fourth; mesothorax and scutellum 

 with very close shallow punctures ; tegula? dark anteriorly, pallid and 

 subhyaline posteriorly ; wings tinged with brown, the nervures piceous ; 

 abdomen with black hair mixed with the pale on the basal parts of 

 segments three to six ; apex of second segment with coarse black 

 hair ; third to sixth segments with apical or subapical bands of white 

 tomentum (such as are seen in females of Synhalonia), these bands 

 successively stronger on each segment going backwards ; apical plate 

 black, broadly truncate, very little narrowed posteriorly ; last ventral 

 segment with a short square tooth or process on each extreme lateral 

 margin ; legs black, the tarsi ferruginous, the basal joints black or 

 blackish on the outer side, the hair on inner side of basal joints 

 orange-ferruginous ; middle tarsi slender but normal, first joint with 

 no apical process ; both spurs of hind tibiae hooked apically ; basal 

 joint of hind tarsus with a couple of red curved bristles at apex, 

 simulating a curved spine. 



Hob. Fort Collins, Colorado, May 29th, 1901, and May 28th, 

 1901 (Colorado Agricultural College) ; Boulder, Colorado, May 

 17th, 1902 (S. A. Johnson, 496). 



Allied to S. gillettei, Ckll., but easily distinguished by the 

 smaller size, hooked spurs, &c. The May 29th example is 

 recorded as from mountain ash, taken by Mr. Titus. I had 

 described this as a new species, but having some misgivings lest 

 the remarkable character of the hind spur might have been over- 

 looked in the description of one of Cresson's, I asked Mr. Viereck 

 to examine Cresson's types with this question in mind. He has 

 very kindly done so, and reports that in S. frater, dilecta, lepida, 

 and all the other species of Synhalonia in the collection at Phila- 

 delphia the spurs are simple ; except in the male of S. speciosa 

 as determined by Kobertson, who has taken the sexes in coitu. 

 In this male speciosa the spurs and the peculiarities of the hind 

 tarsi are just as described above, and it is evident that the species 



