122 NEW YORK STATE MUSEUM 



Eggs. The egg miasses of the group T a n y p u s doubtless 

 vary as much in form and manner of deposition as do those of 

 C h i r o n o m u s. The eggs of one species of T a n y p u s are 

 described by Hammond (Postal Microscopical Journal) as cir- 

 cular gelatinous masses, adhering to floating objects. The eggs 

 are arranged in double rows, along about eight straight and 

 parallel lines which extend across the disk (pl,31, fig.ll). I have 

 caught female specimens of a species of Tanypus (A. 

 m o n i 1 i s) while laying eggs and found still attached to the 

 abdomen a string of eggs, resembling that of Ceratopogon 

 ( S p h a e r o m y a s) a r g e n t a t a . From an examination of 

 the dried egg strings it appears that in this species the eggs are 

 arranged transversely, the egg string being about 1.5 inches in 

 length. 



Larva. All the species of this group agree, as far as I am 

 aware, in having an elongate cylindrical body, a more or less 

 elongate head, a someAvhat enlarged thorax and distinctly marked 

 abdominal segments, to the last of which are attached the legs. 

 The head in some species is narrow and slender, over twice as 

 long as wide, and in others less than 1.5 times as long as wide. 

 The eye spots are situated on the sides of the head a little 

 cephala.d of the middle. The antennae are more or less elongate, 

 in some species quite long and slender, in others short and stout, 

 varying in length from less than 1.5 to over three times as long 

 as the mandibles. The basal joint ranges from two-thirds to 

 nine-tenths of the entire length; the second joint is usually 

 slender, the third and fourth very minute. At the apex of the 

 first joint (at the base of the second joint) is a slender process 

 nearly or quite as long as the second joint. The antennae 

 are retractile to about the apex of the long basal joint, ex- 

 tending back into sockets in the head. They are retracted 

 by special muscles, and extended again by blood pressure. Mein- 

 ert (1882) was the first to call attention to the retractile antennae 

 of Tanypus larvae. The labrum is broad, truncate in front, 

 smooth on the dorsal surface, the under surface delicately haired. 

 In some species I have observed several pairs of very slender 

 jointed a])pendages (pl.20, fig.G) . I have discovered no part which 

 is comparable to the epipharynx in C h i r o u o m u s. 



