36 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.79 



(19) WINTHEMIA LATEVITTATA van der Wulp 



Exorista latevittata van Dm Wtjlp, Biologia Dipt., vol. 2, p. 66, 1890. 



The species is known only in the male sex. It resembles pinguis 

 but may be readily separated by the characters mentioned in the key. 



Male. — Front at narrowest (before vertex) 0.234 of the head width 

 in the single specimen; parafrontals clothed with short hairs; thorax 

 marked with four black stripes narrowly separated in front but fused 

 behind suture effecting two broad bands ; palpi blackish on basal half 

 or more, tips yellowish; abdomen with uniform bluish-gray pollen, 

 which extends almost to the hind edge of segments 2 and 3 ; fourth 

 segment largely reddish ; venter of third and fourth segments thickly 

 haired but without any sharply defined patches. Wings and legs 

 as in pinguis. 



Length, 9 mm. 



Redescribed from one male cotype in the United State National 

 Museum from Xucumanatlan, Guerrero, Mexico, 7,000 feet, July 

 (H. H. Smith). 



(20) WINTHEMIA MONTANA, new species 

 Plate 1, Figure 1 



A robust species with a supplementary outer row of frontal 

 bristles on the widest part of the front ; face tinged with yellow, the 

 parafrontals densely gray poUinose to vertex; thorax conspicuously 

 vittate. 



Male. — Front 0.23 of the head width in the two specimens, slightly 

 narrowed before vertex and thence widening rapidly to base of 

 antennae; parafrontals densely pilose; median stripe reddish brown, 

 exceeding the width of one parafrontal above; inner verticals mod- 

 erately developed ; outer ones about one-half as large ; ocellars present, 

 rather small ; no orbitals ; frontal bristles directed inward becoming 

 smaller upward and stopping before triangle, the lowermost about 

 on level with arista; parafacial with a few hairs near middle on 

 inner margin, not much narrowed below; antennae black, apex of 

 second joint and base of third reddish, third joint two and one-half 

 times as long as second and about as wide as parafacial at narrowest ; 

 arista longer than antennae slightly thickened on jDroximal third, 

 penultimate joint short; vibrissae on level with oral margin, the 

 ridges above practically bare; palpi yellow, bearing numerous black 

 hairs; cheeks blackish, thinly pruinose and densely haired, about 

 one-seventh the eye height; beard white, rather bushy. 



Thorax black, cinereous poUinose; mesonotum marked with four 

 well-separated broad black stripes not interrupted at suture; scutel- 

 lum beyond the narrow base red, thinly sprinkled with pale-grayish 

 pollen ; calypters white. 



