1366 FAMILY LXV. RIIIPIPTIORID/E. 



rated along the suture; tarsal claws bifid at tip. The larvae are 

 parasitic on the young of wasps. Font 1 of the eight recognized spe- 

 cies have been taken in Indiana, while three others may occur. 



KEY TO INDIANA SPECIES OF RHIPIPHORUS. 



(i. Front coxre not separated by the prosteruum. 



1>. Front tarsi of male spinulose beneath; elytra very acute. 



c. P.asal lobe of thorax with a strong elevation; male elytra wholly 



yellow, the abdomen black ; female elytra yellow, tipped with 



black, abdomen red. FLAVIPENNIS. 



<<. I'.asal lobe of thorax transversely notched at tip; elytra of male 



yellow with black margins and tips; of female yellow with apical 



third black. 2531. DIMIDIATUS. 



1>1>. Front coxae of male with three joints pubescent beneath. 



(1. Second joint of hind tarsi shorter than third and flat above. 



c. I'.asal lobe of thorax with an obtuse elevation and a deep pit- 

 each side; elytra brownish-black at base. BIFOVEATUS. 

 ee. I'.asal lobe of thorax not elevated, its surface regularly convex; 

 punctures of met a sternum separated by at least their own 

 diameters; color variable. 2532. PECTINATI s. 

 <lil. Second joint of hind tarsi longer than third, subcylindrical ; lobe 

 of thorax neither carinate nor notched. 2533. CRUENTUS. 

 mi. Front coxa? separated in nearly their entire length by the slender process 



of prosternuin. 



/. Second joint of hind tarsi longer than half the third and not flattened 

 above; piceous, iridescent. LINEARIS. 



//'. Second joint of hind tarsi shorter than half the third and flattened; 

 head and thorax reddish-yellow, the latter with black oval spot. 



2534. LIMBATUS. 



2531 (8174). RHIPIPHORUS DIMIDIATUS Fab., Spec. Ins., I, 1781. 332. 



Black ; elytra pale yellow with tips and sometimes the outer and su- 

 tural margins black in male; apical third black in female; antenna 1 of male 

 pale yellow; of female piceous. the two basal joints reddish. Thorax with- 

 out apical impression, the hind lobe emarginate ; surface coarsely and dense- 

 ly punctate; elytra flat, sparsely punctured, rapidly narrower and very 

 acute at tip. Length 5-0 mm. 



Vigo, Knox and Gibson counties; scarce. July 10-August 11. 

 Occurs especially on the flowers of the narrow-leaved mountain 

 mint, Pycnanthemum U>tifuliniii Pursh. The male is evidently rare, 

 as but one of the ten specimens at hand is of that sex. 



2r>32 (8177). RuiPiPiioRrs PEOTINATVS Fab.. Syst. Knt. 17! IS. 2fi3. 



Color exceedingly variable, ranging from body entirely black, except 

 a reddish abdomen, to black with thorax and elytra reddish-yellow; an- 

 tenna? of male usually reddish with the branches black; those of female 

 black with two basal joints reddish. Structural characters as given in key. 

 Length 4-7.5 mm. 



