WILLIAM G. DIETZ 121 



In appearance, this species is scarcely distinouishable from 

 P. urocera and P. okefenoke, except that the outer flageUar 

 joints are entirely brown. However, the form of the peculiar, 

 slender, serpentine, inner apical appendages of the hypopygium 

 easily distinguishes this si)ecies from the other two, in which like- 

 wise these appendages are strongly developed. The type and 

 one paratype are in the collection of Mr. C. P. Alexander, who 

 kindly placed his material in my hands, two paratypes in author's 

 collection. Cell M' varies from sessile to moderately long 

 stemmed. 



Pachyrhina tenuis hamata subsp. n. (PI. VII, fig. 28.) 



Agrees in all essentials with P. tenuis Loew. The occiput Ls subopaque; 

 thoracic dorsum with considerable luster, but differs in the large, geniculate, 

 rod-like appendages of the guard of the penis. There is a rather large, reddish 

 spot in front of the alar insertion, which I have not observed in any specimen 

 of P. tenuis at my disposal. 



Holotype: cf ; Sullivan County, New York. August, 1912. 



Pachyrhina calinota spec. n. (PI. IV, fig. 7.) 



Yellow. Frontal prolongation with brown median stripe. Occiput opaque 

 with fuscous line. Thoracic stripes silvery-gray, i)ruinose, the lateral stripes 

 curved outward and ending in a velvety Ijlack spot. Stigma brown. 



Male. Length, 13 mm.; wing, 11 mm. 



Head. Mouth parts and palpi dark yellow, tinged with fuscous, the last 

 joint of the latter a little longer than the three preceding joints together. 

 Proboscis very short; pale yellow, frontal prolongation with median dark 

 brown stripe extendin; to end of nasus, the latter densely beset with !)lack 

 hairs. Face and perior.ntal margin pale yellow. Antennae moderately roljust, 

 not elongated, joints on<^ to three sordid yellow, the following joints brownish- 

 3'ellow, basal enlargement black with a verticel of black setae; pul)escence 

 very short, dense, whitish. Front and occiput orange-yellow, opaque, gib- 

 bosity marked, a small brown dot behind the antennal insertion; occiput with 

 fuscous line which does not extend to the summit of the gibbosity. 



Thorax. Pronotal scutu. . with median brown spot, sides tinged with fus- 

 cous and edged posteriorly with dark brown. Praescutum orange-yellow, 

 opaque, sides paler, stripes silvery-gray i)ruinose, sliining, edged with ferru- 

 ginous, the median stripe strongly narrowed posteriori}' and divided by a black 

 median line; the lateral stripes curved slightlj- outward anteriorly, with an 

 opaque, blackish spot beneath its anterior end. Scutum sordid yellowish, an 

 oblique stripe each side, similar to those of the praescutum and consisting of 

 two coalescent si:)ots, the antero-exterior of which is the smaller; an elongate 



TKANS. AM. E.NT. SOC, XLIV. 



