AMKRICAN DIPTERA. 159 



NEW AND LITTLE KNOWIV DIPTEKA FROiVI THE 



ORGAN i»IOL'NTAINS ANI> VICINITY 



IN NEW MEXICO. 



BY C. H. T. TOWNSEND. 



The f()llo\vin<^ are descriptions and notes made some time since, 

 which it is thought desirable to publish at the present time : 



^■iyHtropiis aminophiloi<le^ n. sp. 



Three males, September 3rd, 4th and 5th ; and one female, Sep- 

 tember 5th, all on flowers of Lippia wrightii, at La Cueva (Riley's 

 Ranch), Organ Mts., N. M., about 5300 ft. Difl^ers from Loew's 

 description of macer as follows : 



Length of botli sexes 14 to 14.5 mm. not incliuling antennae, which are 3 mm., 

 aud not making allowance for curvature of abdomen. Length of wing 8 to 10 

 mm. It is thus a larger, more robust species. Length of head and thorax taken 

 together, 4 to 4.75 mm. Length of antennje, as given above, was taken straight, 

 not following the angle. Third antennal joint 2.25 to nearly 3 times length of 

 second. Spots of humeri and hind angles of thorax bright yellow, instead of 

 white. First abdominal segment sometimes rufous on posterior half, more often 

 with but little or no rufous. Last three segments always black, as in macer. 

 Cosfe all black. Anterior femora rufous in middle on underside, all the rest of 

 legs black, except white and yellow pubescent lines on front and middle tibise 

 and metatarsi. Halteres soft brownish, whole anterior side of knobs and distal 

 half of posterior side yellow. Wings pale fuscous, a distinctly deeper fuscous 

 occupying costal cells, proximal two-thirds or more of marginal cell, proximal 

 half of first submarginal cell, and vicinity of anterior cross-vein. Anotlier area 

 of deeper fuscous occupies proximal half of second basal cell, usually continued 

 along inner border to posterior cross-vein, which is also clouded with it. Some- 

 times the deeper shading is subobsolete or of less extent in marginal aud sub- 

 marginal cells. Origin of third vein still more deeply clouded, showing a dark 

 brown spot, and this is usually the case with the anterior cross-vein. First an- 

 tennal joint somewhat sparsely clothed with tine white pubescence, sometimes 

 showing as yellowish, second joint thickly clothed with shorter black pubescence. 

 The pubescence of first joint appears black if not examined with proper light. 



The hind legs are excessively elongate, being 18 to nearly 22 mm. 

 long. The sexual differences pointed out by Osten Sacken in the 

 Biologia are exactly the same in this species. 



This is a most interesting fly, as it imitates very closely a common 

 Amniophila, which visits the same flowers of Lippia urightii, and 

 which Professor Cockerell says is probably A. vulgaris Cr. In his 



TRANS. AM. ENT. SOC, XXVII. JANUARY, 1901. 



