230 KANSAS UNIVERSITY QUARTERLY. 



second segment except the sides is opaque black, more broadly so 

 behind; third and fourth segments, each with a large opaque black 

 macula, in shape like an inverted goblet or wine glass; second and 

 third segments with very narrow sometimes obsolete subrufescent 

 posterior borders; fourth segment with shining metallic posterior 

 border. Thus, the blue of the abdomen takes the form of- lateral 

 scallops on the second segment, and of interrupted anterior cross- 

 bands on the third and fourth segments. The opaque portions do not 

 reach the sides, though nearly so on the posterior portion of the seg- 

 ments. Pile of the whole body white. Legs testaceous; femora 

 except the tip, a broad ring on the tibiae, the hind tarsi, except some- 

 times the metatarsus, and the distal joints of the four front tarsi, 

 black or fuscous; hind metatarsi enlarged; tibiae without long bristles. 

 Wings hyaline, stigma yellowish. — Length 6 to 8 mm. 



Twenty specimens, taken near timber-line, Manitou Park, Colo., 

 and Estes Park, Colo. (July and August, about 10,000 ft.); three 

 specimens, Magdalena mountains, N. M. (August), are somewhat 

 darker than the others. 



Similar to M. ca'nilescens Will., but distinguishable by the differ- 

 ence in color and shape of the abdominal markings, the lack of two 

 yellowish lateral spots on the second segment, the shape of the second 

 segment, which is distinctly narrowed distally and the absence of a 

 row of bristly black hairs on the front femora. (Comparison drawn 

 from a type of coerulescens in the Kansas University collection). 



Melanostoma mellinum Linn. 



One female, Manitou Park, Colo. (August). Common to Europe 

 and North and South America. 



Melanostoma kelloggi, n. sp. 



Male. Black. Frontal and vertical triangles very large and prom- 

 inent; eyes contiguous for a very short distance, much shorter than 

 the length of the vertical triangle; the latter with light pile, more 

 dusky anteriorly; the frontal triangle, long, black pilose. Antennae 

 brown or fuscous brown. Face deep blue black and, together with 

 the front, partially concealed between grayish yellow pollen; very 

 prominent, not full or rounded as in stegniiin and other species, but 

 somewhat compressed, especially below, and with a large compressed 

 tubercle; no rugose transverse markings; epistoma not prominent. 

 Thorax black, anteriorly bluish black, posteriorly more bronze black. 

 Abdomen not narrowed, black with yellowish brown markings as fol- 

 lows: first segment with a rather small round spot on each side; third 

 and fourth segments with a pair of large square spots; the black of 

 the fourth segment is more shining than that of the preceding seg- 



