258 NEW YORK STATE MUSEUM 



182(3 Chironomus triannulatus Macq. Recueil Soc. Sc. Agfl. 



Lille, p.202. 30 



1838 Chironomus Meigen. Syst. Beschr. 7 : 9, 139 

 1804 Chironomus vibratorius Meigen: Klass. 1 :16, 13 



Male. Dorsum of the thorax yellow, with three black stripes, 

 often confluent posteriorly, a spot on each pleuron, the scutel- 

 lum, sternum and the metanotum shining black. The abdomen 

 black, the base and the incisures yellowish or whitish, the incis- 

 ures of the fourth and fifth segments usually wider, fascia-like; 

 in fact the markings of the abdomen somewhat variable; the anal 

 segment wide; the forceps white. Head brownish yellow; the 

 palpi darker ; antennae brown, its hairs lighter at the tips. Legs 

 black, the fore coxae and femora narrowly white at the bases, 

 each tibia with a wide white or yellow band at the middle, middle 

 femora with the bases widely yellowish, hind femora whitish to 

 the tip; fore tarsi all black or brown; middle tarsi to the third, 

 the hind tarsi to the fourth joint whitish ; metatarsus of the fore 

 leg about one half as long as its tibia. Wings whitish ; venation 

 as figured (pl.29, fig.19). 



Female. The female has the base of the abdomen and the venter 

 yellow, the incisures being whitish. Length 2 to 3 mm. Schiner, 

 loc. cit. New Jersey (Johnson). Some specimens from Chicago, 

 111., agree perfectly with the above descriptions. 



8. Cricotopus debilis Williston 



1896 Orthocladius Will. Trans. Ent. Soc. London, p.275 



(Pl.29, fig.20) 



Male. Red or reddish yellow. Plumosity of the antennae 

 brownish-black. Mesonotum with three shining brown spots or 

 stripes, narrowly separated. Abdomen slender; each segment 

 with brown posterior band. Legs yellow; front femora brown on 

 distal end; front tibiae light yellow on the proximal half or two 

 fifths, dark brown on the distal portion, about one third longer 

 than the corresponding metatarsi ; front tarsi infuscated ; the four 

 posterior femora somewhat infuscated distally. Wings hyaline. 

 Length 2.5 to 3 mm. Williston, loc. cit. St Vincent Island. 



I have examined a cotype specimen of this species now in the 

 Cornell university collectiDn, and find that it should be included 

 with Cricotopus, instead of with Orthocladius as 

 Professor Williston has it ; unless, as the Abbe Kieffer has already 

 pointed out, Cricotopus should be considered as a synonym 

 of Orthocladius. 



