Vol. 5, p. 89-92. June 9, 1924. 



Occasional Papers 



OF THE 



Boston Society of Natural History. 



NOTES ON MILTOGRAMMINAE WITH DESCRIPTIONS 

 OF TWO NEW SPECIES. 



BY H. W. ALLEN. 



Senotainia vigilans, new species. 



Male. — Front at narrowest 0.38 of the head-width (average of two 0.37, 0.39) ; 

 frontal vitta brown, at base of antennae at least twice as wide as lowest ocellus, 

 broader posteriorly; vertex and upper part of the front including the vitta, 

 golden pollinose, remainder of front and the face silvery; about twelve weak 

 bristles in each frontal row; only two orbitals present, approximated at their 

 insertion which is near the vertex, the lower one proclinate, the upper reclinate; 

 parafrontals nearly bare of hairs; vibrissae length of second antennal joint 

 above front edge of oral margin, and separated by one and one-half times length 

 of second antennal joint; facial ridges bare save for one or two small bristles just 

 above vibrissae; no scattered bristly hairs lateral to vibrissae; antennae extend 

 three-fourths distance to vibrissae, second joint yellow at least apically, third 

 joint yellow usually overlain with blackish tomentum, twice the length of the 

 second joint; arista thickened on the basal three-fifths, penultimate joint 

 slightly longer than broad; parafacials bare; in profile, buccal width one-tenth 

 eye-height and subequal to width of parafacial, front projects nearly half the 

 eye-width; axis at vibrissae slightly less than at base of antennae. Thorax 

 cinereous, with four indistinct black vittae; postsutural dorsocentral bristles 

 becoming rapidly weaker from back to front, usually but two differentiated; 

 two sternopleurals; three pairs of marginal scutellars of about equal size. 

 Abdomen red save the base of the first and the apex of the fourth segments 

 which are black, thinly gray pollinose except the numerous polished spots on 

 dorsum; first segment without median marginal macrochaetae, second with a 

 weak pair, third and fourth with marginal rows of about eight bristles. Inner 

 forceps of the genitalia moderately stout, tapering to sharp, stout points, united 

 save for minute cleft at the apex; outer forceps almost as long as the inner 

 pair, bulbous at base, suddenly constricted to angular stem which is expanded 

 again at tip into process with sharp angles at front and back, the larger rear 

 angle apposed to tips of inner forceps; sides of fifth sternite large, lobiform, 

 nearly bare of hairs. Wings without costal spine; one bristle at base of third 

 vein. Legs black; middle tibia with a single bristle on outer front side near 

 middle; hind tibia with a row of irregular bristles on outside, not extending far 

 beyond the middle; hind femur bearing villous hairs equaling its thickness on 

 proximal third of under surface. 



Female. — Front at narrowest 0.35 of head-width (measurements of six as 

 follows: 0.33, 0.33, 0.34, 0.34, 0.38, 0.38); frontal vitta at base of antennae 

 three times width of lowest ocellus; buccal width equal to one-eighth eye-height. 

 Pulvilli much shorter than last tarsal joint. Otherwise like the male save for 

 usual difference in genitalia. 



Length 5 to 6 mm. 



Type. — Male, in the U. S. National Museum. Adaton, 

 Mississippi, August, 1922. 



Allotype. — Female, in the U. S. National Museum. Adaton, 

 Mississippi, July 15, 1922. 



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