21. TEICHOEHACH.US. OH ^9 



21. TBICHORHACHUS. 



Intermediate between Schizocerus and Hylotoma. 



Head moderately large ; antennae with the first two joints very 

 short ; the third long and bifurcated in the male, the branches 

 appearing almost to spring from the head, in consequence of the 

 shortness of the basal joints. The branches are clothed with long 

 cilia on the outside ; the inner branch is straight, and the outer one 

 curves round so as almost to meet it at the tip. Antennas in the 

 female simple and very short. "Wings with one marginal appendicu- 

 late cell and three submarginal cells ; the stigma is very large, and the 

 nervure beneath it is curved in such a manner that both the marginal 

 cell and the first submarginal cell are narrowed and contracted at their 

 base ; lanceolate cell small, petiolated. Legs not dilated ; four 

 hind tibiae with middle spnrs. 



1. Trichorhaclms australis. 



Hylotoma (Schizocera) australis, Westw. Arc. Ent. i. pi. vii. fig. 2 

 (1841). 



Hab. West Australia. 



2. Trichorhaclms sobrinus. 



(Plate III. fig. 3.) - Wl 



Exp. al. 6 lin., long. corp. 3 lin. 



Shining bluish green ; cheeks, antennas, head below the antennas, 

 and the extremity of the abdomen beneath testaceous ; front tibiae 

 and tarsi testaceous, the four hinder ones brownish above and pale 

 beneath. Wings hyaline at the base, and infuscated beyond the 

 middle. 



Hab. Australia ? 

 a. <S . (Type of species.) Australia ? 



3. Trichorhaclms hyalinus. 



(Plate III. fig. 4.) 



Precisely similar to T. sobrinus, but the front tibiae and tarsi are 

 brown and the four hinder ones blue, and the wings are hyaline and 

 iridescent. 



Hab. West Australia. 

 a. rf . (Type of species.) Swan Eiver. Mr. Du Boulay. 



4. Trichorhaclms nitidus. 

 (Plate III. figs. 1 & 2.) 



Exp. al. 5 lin., long. corp. 2| lin. 



Head and thorax coppery green ; abdomen blue, greenish beneath ; 



