258 NEW YORK STATE MUSEUM 



]S2(! C h i r 11 o iii n s t r i a n n u 1 a t u s ^laeq. Rec-ueil Soc. Sc. Agri. 



Lille, p.202, 3U^ 

 1838 C; li i r o n o in u s Meigen. Syst. Bescbr. 7 : 9, 139 

 1804 Chirouomus vibrato rius Meigen. Klass. 1 : 16, 13 



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

 ofteu coiitiuent posteriorly, a spot on each pleuron, the sciitel- 

 hiin, sternum and the metanotum shining black. The abdomen 

 bla<k, the base and the incisures yeHowish or whitisli, 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 wliite. Head brownish yellow; the 

 paljii darker; antennae brown, its hairs ligliter at the tips. Legs 

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

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

 feuiora with tlie 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. Wiugs whitish; venation 

 as figured (pl.29, fig.l9). 



Female. The female has tlie 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, 

 III,, agree perfectly with the abo\e descriptions. 



8. Cricotopus debilis Williston 



1896 O r tlio c 1 a d i 11 s Will. Trans. Ent. Soc. London, p.27.5 



(Pl.29, fig.20) 

 Male. Ked or reddish yellow. Plumosity of the antennae 

 brownish-black. ^lesonotum with three shining brown S{)ots or 

 stripes, narrowly sejiarated. Abdomen slender; each segment 

 witli brown ](ost(u-ior band. I.egs yellow; front femora brown on 

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

 fifths, dai'k brown on the distal portion, about one third longer 

 than the corres]tonding niclatarsi ; front tarsi infuscated; the four 

 ])osterior femora somewliat infuscated distally. Wings hyaline. 

 Length 2.5 to :] mm. ^^'illisl()n, loc. cit. St Vincent Island. 



I have examined a coty])e s])ecimen of this species now in the 

 Cornell university collecti »n, and find that it should be included 

 with C r i c (► t o p u s . instead of with Orthocladius as 

 Professor NN'iiliston has it ; unless, as the Abbe Kieffer has already 

 X)ointed out, C r i c o t o p u s should be considered as a synonym 

 of Orthocladius. 



