144 GEO. H. HORN, M. D. 



IWECKOSCAFHA Lee. 



M. arctica n. sp. — Oval, convex, a little more acute posteriorly, not twice 

 as long as broad, ferruginous brown, somewhat shining, sparsely clothed with 

 recumbent brown hairs. Head sparsely indistinctly punctate. Thorax sparsely, 

 but regularly punctate, punctures finer in front. Elytra a little more coarsely 

 punctured than the thorax, the punctures sparse and a little more distant near 

 the apex, each having a short hair ; scutellum entirely invisible. Body beneath 

 a little paler than above, sparsely pubescent, sparsely punctate, the punctures 

 of the abdomen finer and closer than on the metasternum ; mesosternum. as seen 

 between the coxge, cordiform. Length .09 inch. ; 2.25 mm. 



This species is larger, more oval and convex than in clavicornis, 

 as well as different in color, the latter being piceous. In arctica the 

 punctuation is far more distinct, both above and beneath. The 

 following are the essential differences between the species : 



Scutellum visible, base of thorax sinuate each side; mesosternum between the 

 coxffi narrow; last joint of maxillary palpi oval, obliquely truncate, longer 

 than wide; eyes moderately coarsely granulate clavicornis. 



Scutellum invisible, base of thorax regularly arcuate; mesosternum between the 

 coxse cordiform ; last joint of maxillary palpi oval, squarely truncate, about 

 as wide as long; eyes very coarsely granulate arctica. 



These characters might be considered generic, but for the present 

 the two species are but associated under one name. Should it be 

 thought advisable to separate the two the name Crioscapha may be 

 used for arctica. 



In the original description of Microscapha, Dr. LeConte states that 

 the frontal suture is distinct, but on examination no suture is visible 

 in either of the above species. 



Oi' arctica, two specimens were captured at Fort Wrangel, Alaska, 

 by Mr. Wickham, who has kindly presented me with one of them. 



EXPLANATION OF PLATE I. 



Fig, 1. — Elytral markings Galerucella americana. 



" 2, — " " sexvittata. 



" 3. — " " Integra. 



" 4, — " " notulata. 



'■ 5. — " " notata. 



'■ 6. — " " xanthomelssna. 



7. — Middle tibise % and 9 of Phyllecthrus. 



" 8. — Antennae % and 9 of P- gentilis. 

 9. — Antennse % and 9 of P. dorsaUs. 



" 10. — Last ventral segments % and 9 of Galerucella cavicollis. 



" 11. — Last ventral segments % and 9 of Galerucella americana. 



" 12. — OutUne of Androlyperus fulvtts %, . 



" 13. — Ventral segments of the same, 



■' 14. — Elytral markings Diabrotica connexa. 



" 15. — " " picticornis. 



" Ifi. — " Malacosoma vittipenne. 



" 17. — " Triarius triviffatus. 



*' 18. — Head and thorax Dacoderus striaticeps. 



" 19. — " " " Isevipennis. 



" 20. — " " " dominicensis. 



