215 



of in this genus, or in any chironomid genus, being in some cases 

 as long as 60 mm. The absence of the ventral anal respinatory 

 organs is peculiar and led me to suppose that the larva very probably 

 was confined to rather shallow water. An examination of the material 

 in the collection here proves that while as a rule this is the case, 

 and while the larva." are generally found in places where there is not a 

 strong current, some specimens taken by Dr. C. C. Adams were from 

 the river at depths of ten and a half and twelve and a half feet. From 

 available information it is evident that the larva; live in the mud at 

 the bottom. This habit of embedding themselves in the mud must 

 prove of considerable advantage to the larvre in protecting them from 

 enemies, as their large size and bright color make them rather con- 

 spicuous objects. The disparity between the size of the larva and 

 that of the adult is most remarkable. 



Lorz'a. — Length, 45-60 mm. Color in life bright red; when 

 dead, varies in color from yellowish to almost white. 



The following description is of specimens preserved in alcohol. 



Head pale yellow, posterior margin and ventral surface brown, 

 margins of mouth parts brown ; 2 black eve-spots on each side of 

 head ; antenna not elongated, the apical joints very much smaller 

 than the basal joint (PI. XIV, Fig. 18). Mandibles strongly toothed 

 (Fig. 25); labium with the center tooth trifid (Fig. 17); palpi as 

 in Figure 19; anterior prolegs large, their apices swollen and covered 

 with rather soft hairs; first segments of body (thoracic) longer than 

 second by almost one half (3-2), second and third subequal in length 

 and l>oth together sul)equal to fourth (first alxlominal), fourth 

 about two thirds as long as fifth, fifth to tenth of almost ec|ual length, 

 eleventh about three fourths as long as tenth, twelfth barely more 

 than one fourth as long as eleventh, apex of twelfth segment with 

 two small dorsal protuberances on which are situated several hairs; 

 anal blood gills present and well developed ; ventral blood gills absent ; 

 anal prolegs large, swollen, their apices with a circle of short thorns 

 (Fig. 20). 



Pupa. — Length about 20 mm. Thoracic respiratory organs with 

 hairlike filaments; antennae reaching beyond base of wing cases; 

 abdominal segments flattened dorsally, without any distinct projec- 

 tions; apical segments shortened, distinctly broader than long. 



The condition of the single specimen before me is poor and 

 prevents a more detailed description. In most particulars it agrees 

 closely with the pupa figured by Johannsen on Plate XVI of his 

 paper on Chironomidcc in Bulletin 86 (1905) of the New York State 

 Museum. 



