180 INSECUTOR INSClTLt MENSTRUUS 



ground. TTiis specimen was evidently captured when fresh and still 

 unfed. The female distindum are older specimens that had fed and aie 

 partly crushed ; in consequence the abdominal markings are obscured, 

 although still clearly discernible in one of the specimens. The name dis- 

 tinctum had already been applied to a Brazilian species af Simulium by 

 Lutz in 1910; trivittatum therefore supersedes it in the present case. 



Parasimulium Malloch. 



Tech. Ser. 26, Bur. Ent.. 24 (1914). 

 The genus Parasimulium was founded on a single specimen stated to 

 be a female. The type of Parasimulium furcatum Mall, is a male, 

 instead of a female, as already appears from the description through the 

 indication of enlarged facets on the lower part of the eyes, a common 

 and well-known male cheuracter in certaun families of Diptera. The male 

 clasping orgems are plziinly visible in the specimen and furthermore are 

 yellow, contrasting conspicuously with the dark body-color. Thus the 

 genus is erroneously conceived. The specimen shows some striking 

 peculiarities and probably the genus can be reestablished on other char- 

 acters when the female is discovered. 



/ 



/ SOME NEW CHALCIDOIDEA 



By J. C. CRAWFORD 



Both of the foDowing new species of the genus Tetrastichus belong to 

 the section which beeurs only one bristle on the submetfginal vein. 



Tetrastichus compsivorus, new species. 



Female: Length 1 mm. Black, the femora deirk brown, the tibiae 

 lighter, the middle and hind tarsi whitish ; first joint of funicle distinctly 

 shorter than pedicel, the second about as long as the first, the third shorter, 

 hardly longer than broad ; club about as long as joints 1 and 2 of funi- 

 cle ; mesonotum sericeous, the median groove on mesoscutum and discal 

 padr on scutellum faint ; propodeum short, the medial carina no longer 

 than metanotum ; wings brownish ; submargineJ with one bristle. 



Male: Length 0.87 mm. Similar to the female except for secondary 

 sexuail characters. 



Type locality ; Chickasha, Okla. 



Host : Eggs of Compsus auricephalus. 



