25S NKW YORK STArr. MUSEUM 



IS'Ji! C li i r o n o in u s ( r i a n n u 1 a t u s Maoq. Rtvnoil Soc. Sc. Agri. 



Lille, p.202, 30 

 ISoS Chirouoiuus Moigou. Syst. Kosohr. 7:0.130 

 ISCKl C h i r o n o lu us v i b r a t o r i u s Meigen. Klass. 1 : IG, 13 



Male. l>oi-siiiH of the thorax yollow. \\\\\\ tlinv bhuk istrii)es, 

 often oontluent postoi-ioi-lv. a spot on oacli plouron, the sciitel- 

 luin, stevuiini and tlie nietanofiini shiniiiii black. The abdomen 

 bkuk, the base and the ineisut-es yellowish or whitish, the iueis- 

 nivs of the fourth and tifth soiinuMiis usually wider, fasoia-like; 

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

 seiiineut wide; the foneps white. Head brownish yellow; the 

 pal}.i darker; antennae brown, its hairs lighter at the tips. Legs 

 black, the foi'e coxae and femora narrowly white at the bases, 

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

 femora with the bases widely yello^\ ish. 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 tigui*ed (pl.'JJ). tig.i;)). 



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

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

 loc. cit. New Jersey (Johnson k Some specimens from (^hicagr). 

 111., agree perfectly with the abov(> descriptions. 



8. Cricotopus debilis ^YillistoIl 

 1S96 Orthocladius Will. Trans. Ent. Soc. London. p.2"> 



(P1.29, fig.20) 

 Male. Ked or reddish yellow. Plnmosity of the antennae 

 brownish-black. ^lesonotum with three shining brown spots or 

 stripes, narrowly separated. Abdomen slender; each segment 

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

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

 fifths, dark brown on the distal ]>ortion. about one third longer 

 than the c(n-responding metatarsi ; front tarsi infuscated ; the four 

 posterior femoi-a somewhat infuscated distally. Wings hyaline. 

 Length 2.o to '.\ mm. \Villiston. 1«>«'. cit. St Vincent Island. 



I have examined a coty]>e s]H^cimen of this species now in the 

 Cornell university collect! .m. and tind that it should be included 

 with C r i c o t o j) u s , instead of with Orthocladius as 

 Professor Williston has it : unless, as the Abl>e Kieft'er has already 

 pointed out. Cricotopus should be considered as a synonym 

 of O r t h c 1 a d i n s. 



