MAY FLIES AND MIDGES OP NEW YORK 231 



toward the posterior end, somewhat darker; the posterior seg- 

 ments somewhat flattened; the forceps moderately long and 

 strong. Head yellowish, palpi brown, antennae brown, with its 

 hairs lighter, the basal joinf yellow. Legs pale yellow; the ex- 

 treme tip of each tibia brown; the tarsi toward the end some- 

 what darker ; the foremost pair delicately haired, but not bearded ; 

 the fore metatarsus one third longer than its tibia; occasionally 

 the fore tibiae and tarsi darkened; the femora, .however, are 

 usually somewhat greenish. The fore femora and fore tibiae are 

 of about equal length. Wings whitish, with pale veins. 



Female. The antennae are yellow and have brown tips. Length, 

 5.5 to 6.25 mm. Translation from Schiner loc. cit. Florida 

 (Johnson). 



48. Chironomus dux n. sp. 

 (P1.29, fig.8) 



Larva. The blood-red larva resembles in structural detail that 

 of C. modestus (pl.22, figs. 9 to 11). The labium differs in 

 having the second lateral tooth smaller than the third; somewhat 

 resembling fig.l on pl.21, but the second lateral is more distinctly 

 separated from the first. 



Pupa. The pupa has the dorsal surface of the fourth, fifth and 

 sixth abdominal segments marked somewhat like that shown on 

 pl.22, fig.15. The second and third segments are more widely 

 covered with microscopic setae, leaving here and there small, cir- 

 cular, bare spots. The terminal comb of the lateral fin of the 

 eighth segment resembles that shown on pl.22, fig.16, but the comb 

 stands out more nearly at right angles with the long axis of the 

 body, and the teeth are somewhat curved caudad. 



Imago, male. Length 5 to 6 mm. Bright green. Head and 

 proboscis and basal joints of palpi pale green, the apical joints 

 of palpi slightly infuscated. Basal joint of antenna yellow, the 

 flagellum fuscous, the hairs brownish. Dorsum of thorax with its 

 three stripes, the metathorax, the sternum and a few spots on the 

 pleura buff-colored ; the humeri, space between the dorsal stripes, 

 space in front of the scutellum, the scutellum and the pleura, 

 green. Abdomen green with pale hairs. Genitalia yellow. Coxae 

 and femora green, middle and hind tibiae greenish or yellowish, 

 fore tibiae yellowish, slightly infuscated. Tarsi fuscous, the 

 metatarsi slightly paler. Middle and hind legs rather hairy; fore 

 legs nearly bare. Fore metatarsus about one third longer than 

 its tibia ; wings hyaline, the anterior veins yellow, the crossveins 

 the same color; venation as figured. Halteres green. 



Female. Slightly darker than the male. Dorsal stripe of the 

 thorax more brownish, tibiae slightly infuscated, especially the 

 f. , nt pair; and the extreme tips of the femora also show a trace 

 of brtwn. Ithaca, N. Y. 



