332 EDWARD NORTON. 



Table to assist in Jindinj the species. 



Sec. 1. Anterior tibise with one side sj^ur. Second brachial cell without cross- 

 nervure : 



Testaceous, with paler spots, not clearly defined 1. ochrocera. 



Testaceous, with distinct paler sjjots 2. brunnicans. 



Black, pale spots: 



Abdomen black, venter pale , 3. maculiventris. 



Abdomen black, venter pale 4. credita. 



Abdomen rufous, pleura black 5. bicolorata. 



6. tesselata. 



Abdomen rufous, pleura pale 7. variegata. 



Sec. 2. Anterior tibiae without side spur : 



Tribe 1. Third joint of antennas sometimes twice or thrice as long as fourth ; 

 second brachial cell with incomplete cross-nervure, broken at lower tip ; 

 Black, abdomen black or with yellow bands ; 



Head mostly black, wings faseiate with black 8, fasciata. 



Head mostly pale, wings black 9, plagiata. 



Head mostly black, wings clear 10, canadensis. 



Black, abdomen with rufous bands *. 11, excavatus. 



Black, abdomen rufous : 



Antennse black 12, pallimacula. 



Antennte rufous 13, pacifi.ca. 



Tribe 2. Third joint of antennse but little longer than fourth; second brach- 

 ial cell with incomplete cross-nervure (not extending more than half 

 across the cell) : 



Testaceous c 14, ocreata. 



Black, abdomen rufous; 



Antennse yellow banded 15, luteicornis. 



Antennse black, side lobes of mesothorax black 16, scripta. 



Antennse black, side lobes of mesothorax yellow 



spotted 17, multicincta. 



Black, abdomen rufous banded, cheeks black, no oval 



spots above ocelli ". 18, rufofasciata. 



Black, tergum banded with white 19, semicincta. 



Black, tergum black, venter banded witli white 20, cavifrons. 



Black, legs pale 21, inconspicua. 



Species not assigned 22, circumcinctar 



23, amplecta. 



1. L. ochrocera. 



Ityda ochrocera, Harris' Catalogue. 

 Testaceous, with spots on mesothorax; tergum black, sides edged with brown. 

 Length 0.44. Br. wings 0.92 in. 



% . Testaceous; antennae 28-jointed. long, 3rd joint one-half longer 

 than 4th; color brown, blackish toward apes; head large, shiniug, coarse- 

 ly punctured, with obsolete or indistinct yellow crescents about the 

 ocelli and spots at base of antennas; tegulae and spots before V-spot, 

 two stripes on side lobes of mesothorax, scutel and behind, indistinctly 

 paler than rest of body; a spot on each side of mesothorax near tegu- 



