ZENILLIA AND ALLIED GENERA — SELLERS 7 



with a brownish or tawny tinge; marginal pair of macrochaetae on first 



segment weak 5. hyphantriae (Townsend) (p. 15) 



Antenna with first and second segments and in female base of third segment 



yellow, remainder black ; facial ridge bristly on more than lowest one-fifth, 



often nearly halfway; legs black, tibiae brownish (contrasting) ; abdomen 



with dorsum of first segment black ; segments 2, 3, and 4 completely covered 



with gray pollen; wing veins dark brown, almost black; marginal pair of 



macrochaetae on first segment weak 6. desmiae, new species (p. 16) 



6. Normally with three stern opleural macrochaetae 10 7 



Normally with two sternopleural macrochaetae and three postsutural dorso- 

 central macrochaetae 10 ; females with outer vertical bristle well developed ; 

 middle tibia lacking an inner ventral bristle ; second segment of antenna 

 black ; black, gray-pollinoise species ; apical scutellars normally turned 

 backward ; male abdomen with third and fourth segments shining brown or 

 Mack on venter, contrasting with pollinose second; inner forceps slender 

 apically, almost straight, ending inwardly at apex with a small tooth, hairy 

 about two-thirds of its entire length— 7. virilis Aldrich and Webber (p. 17) 



7. Head, thorax, and abdomen predominantly golden or yellow-pollinose 12 



Head, thorax, and abdomen predominantly black, gray-pollinose 8 



8. Two sternopleural macrochaetae and a sternopleural bristle (rarely indis- 



tinguishable from surrounding sternopleural hairs) and four postsutural 

 dorsocentral machochaetae ; apical scutellars normally turned upward. 

 Male abdomen with third and fourth segments pollinose on venter ; inner 

 forceps rather thick apically, outwardly with long hair to last fifth, 

 which is bent at an obtuse angle (last fifth in autographae, new species, 

 is straight). Male without and female with an inner ventral bristle on 

 midtibia. Female with outer vertical bristle so poorly developed as to 



appear to be lacking 9 



Three strong sternopleural macrochaetae and four postsutural dorsocentral 

 macrochaetae ; strong apical scutellars turned backward. Male and 

 female with an inner ventral bristle on midtibia. Female with well-de- 

 veloped outer vertical bristle 8. blandita (Coquillett) (p. 18) 



9. Legs with femur reddish yellow or yellow ; second antennal joint red or 



yellow 11 



Legs with femur black and tibia blackish; second antennal joint black or 

 at most obscurely rufous 10 



10. Frontal orbit silvery white with a faint brassy tinge; abdominal segments 



gray-pollinose, sometimes lightly tinged with yellow or brown, fourth 

 segment more so but not in striking contrast to intermediate segments 



9. blanda (Osten Sacken) (p. 19) 

 Frontal orbit golden ; fourth abdominal segment golden-pollinose in strik- 

 ing contrast to gray of other segments. 



10. tucumanensis, new species (p. 21) 



11. Tarsi and sides of thorax reddish, blending somewhat with yellow color of 



legs and antennae 11. boarmiae (Coquillett) (p. 21) 



Tarsi and sides of thorax blacker, yellow of legs and antennae making a 

 sharp contrast 12. autographae, new species (p. 23) 



12. Four postsutural dorsocentral macrochaetae 16 



Three postsutural dorsocentral macrochaetae 13 



10 The numbers of dorsocentral and sternopleural macrochaetae are known to vary 

 within certain limits in virilis and blanda; likewise the midtibial, inner ventral bristle in 

 blanda. 



