507 



male of zwif^cs has the second and third fore tarsal joints paler than 

 the first, but not yellow. 



Camptocladius Van der Wnlp 



In mv generic key to the Chirouoniiiuc I have placed only those 

 genera that have l^een regarded as valid by previous American writers 

 who have dealt with the family. In adopting this course I have sep- 

 arated Camptocladius from Orthocladius by means of the character 

 of the posterior branch of the cubitus, which in Camptocladius is bisin- 

 uate, while in Orthocladius it is straight or very slightly recurved at 

 the apex. In treating Orthocladius I have accepted Kieffer's subgen- 

 era as divisions, and find that to be consistent one must adopt a sim- 

 ilar course with respect to Cajuptocladiits, though divisions have not 

 previously been indicated. I propose no names for the divisions of 

 Camptocladius as defined in key herewith, considering it desirable that 

 further investigation of more material and from a larger area than I 

 am dealing with should be made before these concepts are accepted as 

 of generic or even subgeneric value — separable as they are from those 

 of OrtJiocladius only by the character of venation already indicated. 

 It would probably be quite legitimate to disregard the sinuation of the 

 cubitus in the case of the species which possess hairs on the eyes, plac- 

 ing them in TricJwcladius, but lack of information regarding the early 

 stages and the paucity of my material prevent me from adopting this 

 course. 



I have not succeeded in obtaining the early stages of any species 

 of Camptocladius, but two species have been reared in this country 

 from dung, and the fact that Orthocladius stcrcorarius DeGeer has 

 been similarly reared seems to indicate that it belongs to Campto- 

 cladius rather than to Orthocladius, the larvre of the latter being aquat- 

 ic in habit as far as at present known. 0. stcrcorarius is a European 

 species that has been recorded as occurring in Greenland. It is un- 

 known to me. 



Key to Species 



1. Eyes with short upright hairs 2 



— Eyes bare 3 



2. Large species, 2 mm. or more in length ; base of wing- veins black ; 



female with broad sensory organs on flagellar joints. . .1. lasiops. 



— Smallei" species, 1 mm. in length; base of wing-veins not black; fe- 



male with hairlikc sensory organs on flagellar joints 



2. lasioplitliahn us. 



3. Basal 2 joints of flagellum in female very distinctly separated, all 



flagelliu- joints in this sex with ])road sensory organs; black spe- 



