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SEVENTH ANNUAL REPORT 



Measurements of Female — Continued. 



Caloptenus spretus Uhler Mss. 



Syn., Acridium spretum* Tlios. TraiLS. II!. Sr. A^r. Soc , V, 450. 



Very much like C. femicr-rubrum., Burm., the principal difference being in thelengtli 

 of the elytra and wings; a notch at tlie tip of the last [c^j ventral segment. Posterior 

 lobe ot the pronotuni slightly expanding ; median somewhat distinct. Elytra and 

 wings pass the abdomen about one-third tiieir length. The last [cf] ventral segment, 

 which is turned up almost vertically, is somewhat tapering and is notched at the apex, 

 ■which distinguishes it from the femur-rubrum ; the notch is small, but is distinct. Pros- 

 ternal spine robust, sub-cylindrical, transverse. Migratory. 



Color. — Scarcely distinct from the C./emwr-^-M^rwr/i. The occiput and disk of the 

 pronatum generally reddish-brown ; the posterior lobe somewhat paler than the ante- 

 rior and middle. Spots, as \n femur-rubrum, arranged in a line along the middle of the 

 elytra ; these are a little larger and more abundant towards the apex. The head and 

 thorax are sometimes a very dark olive-brown, at others, reddish-brown, and even 

 brownish-yellow, the color deepening with age. The wings are pellucid, nerves dusky 

 toward the apex; when flying high and against the sun, their wings look like largo 

 snow flakes. 



Dimensions.— 2 Length, [to tip of abdomen] 1 to 1.2 inches; elytra as long as the 

 body ; posterior femora, 0.55 inch ; posterior tibi;e, 0.5 inch. ^ Length, 0.85 to 1 inch ; 

 elytra, 0.9 to 1.05 inches. 



*This is called ' 'Acridium spretis, Uhler" in the article alluded to, and I very much doubt if tha 

 description refers to the species in question; first, because I do not believe that sprehts occurs in Mur- 

 physboro, ills., where Mr. Thomas was then residing, and where he quotes Acridium spretis us being 

 quite common; .secondly because the description in some respects would not apply to spretus as at pres- 

 ent delined. 1 call attention to this discrepancy, because it is upon this (as I believe erroneous) refer- 

 ence, that Mr. Thomas quotes spretus from Illinois; Avhereas I agree with Mr. Walsh that (as we 

 understand the species to-day) it is not indigenous to that State. Where the anal characters of the male 

 are not carefully given, it is unpossible to be siu-e of the species . 



