18 BULLETIN 417, U. S. DEPARTMENT OF AGRICULTURE. 



Black species with golden or greenish-golden spots. (Spots sometimes faint in 

 tepidum and morrisonii). 



Thorax with broad basal impressions; elytral striae regular 23. calidum. 



Thorax with small basal impressions; elytral striae frequently confused or 

 faint. 

 Elytra of smooth sculpture, without imbricated appearance. 



24. morrisonii. 

 Elytral striae of medium depth and frequently confused. .25. tepidum. 

 Elytral striae fine, imbricate or transversely rugose. 



(Europe.) 26. auropunctatum,. 



Bronzed species with three rows of chainlike elevations on the elytra; striae 

 confused. 

 Thorax less narrowed behind. 



Basal impressions broad; wings well developed; elytra oblong-oval. 



27. cancellatum. 

 Basal impressions shallow; wings wanting; elytra oval, less deeply 



sculptured 28. subaeneum. 



Thorax more narrowed behind; basal impressions small; wings wanting; 



elytra oval 29. moniliatum. 



Bronzed species without three rows of chainlike elevations ; with three rows of 

 depressed greenish-golden spots. 

 Body elongate, tibiae of mesothorax and metathorax of male curved. 

 (Japan; introduced into Massachusetts and New Hampshire). 



30. chinense. 

 Black species with oval or rounded oval elytra, and without wings; thorax 

 emarginate behind with the angles produced. 

 Outer joints of antennae pubescent as usual: 



Elytra broadly oval, with rows of close-set punctures and intermediate 



rows of more distant punctures 31. discors. 



Outer joints of antennae pubescent only along the sides. 



Elytra longer, oval, striae confused, with three dorsal rows of larger 



punctures 32. wilkesii. 



Elytra broadly oval, with distant rows of faint punctures; sculpture 

 scaly, sometimes nearly smooth. 

 Hind angles of thorax not broadly rounded, sculpture rather rough. 



33. luxatum. 

 Hind angles of thorax broadly rounded, sculpture smooth. 



34. latipenne. 



TABLE FOR DETERMINING CALOSOMA LARVAE. 



The table which follows ^ives characters for separating larvae of 

 different species of Calosoma. Full-grown specimens were used, as 

 more satisfactory determinations can be made with them than with 

 the earlier stages. The larvae must have molted 24 hours or more 

 before an attempt is made to classify them, otherwise the colors will 

 not be normal. In order to show the difference in appearance of 

 larvae of this genus from those of Carabus, an illustration (PI. VI) 

 is given of a third-stage larva of Carabus limbatus. All measurements 

 of larvae have been made as follows : The length has been taken from 

 the base of the mandibles to the posterior border of the anal seg- 

 ment, and the width has been measured at the middle of the meso- 

 thoracic segment. 



The writers realize that this table is incomplete, but it covers the 

 species which they have been able to study and is published at this 

 time in the hope that it may assist anyone who wishes to determine 

 some of the more common larvae of Calosoma. 



With reddish-brown patch at base of caudal appendages in second and third stages. 

 Dorsum shining black in all stages except scrutator, which is sometimes brownish- 

 black. Full-grown larvae more than 30 mm. long. 

 Anterior ventral plate of first to seventh abdominal segments oval without 

 noticeable dilation on anterior middle margin. Outside posterior 

 ventral plates of same segments round without broad notch on inner 



