SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 103 
Melissodes gilensis, Cockerell. 
San Pedro, Calif., July 11. (Cockerell). New to California. 
Melissodes grindelize, Cockerell. 
La Jolla, Calif., August (Cockerell). New to California. 
The females of several species deseribed or recorded above 
ean be easily separated by the following table. I add also a 
species from Arizona. 
Hair of fifth abdominal segment black or purple-black, 
EXCE Di SOMETIME Sura Me xtreme SIdesne tase sae... 4 sc6 iL 
Hair of fifth abdominal segment pale, sometimes dusky 
Ha) “ELMS: TMU NIC ao lene Mel Ae een laa tet gee ar 5. 
1. Hair of the thorax above fulvous, without black (Phoe- 
nix, Ariz., Oct. 8, at flowers of Helianthus annuus) 
MPN rae iyene eee ae gs Melissodes aurigenia, Cresson. 
Hairnor thorax above with much black .2.2)......:.:. Qn 
2. Larger; hair on inner side of hind tarsi clear ferruginous 
(CSzial POGUE yee beae asters irate ee Aen en M. gilensis. Ckli. 
Smaller; hair on inner side of hind tarsi black or dark 
[DIORA io A plcpe bane Snags San Step ae i Seen neTES 0 bt ART IPNG eon 3. 
3. Tegule with a tuft of black hair; subcostal nervure 
black ior almost (Way Jolla) 2.222252. M. grindeliz, Ckll. 
Tegule with a tuft of ight hair, subeostal nervure ferru- 
einous; flagellum ferruginous beneath except at base. .4. 
4. Vertex without hair (Los Angeles)...M. intermediella, Ck. 
Neniexa witihemirch nai (Cataliumeawe yc 4 a4 cee tae. 
MP eee M. intermediella vy. catalinensis, Ckll. 
D. insane hair on inner side of basal joint of hind tarsi 
clear ferruginous; hair of fifth abdominal segment 
with a blackish median stain (Los Angeles....... 
Me eee ok Synhalonia belfragei subsp. virgata, Ckll. 
Smaller; hair on inner side of basal joint of hind tarsi 
pile Kan TOU UO Sie eprepe wear. ee Ge 3c Ane Docent. 21 6. 
6. Flagellum comparatively long, and clear red beneath 
(Los Angeles and Redondo) ...Melissodes stearnsi, Ckll. 
Flagellum short and black (Los Angeles............. 
EU Tae SSG AT a AR ae EAS eae Diadasia laticauda, Ckll. 
Diadasia laticauda, n. sp. 
Female. Length 9 mm. or slightly more; black, head and 
thorax with whitish hair, slightly tinged with ochraceous 
dorsally; mandibles with a golden patch near end; eylpeus 
with very large strong punctures; antenne short, black, the 
flagellum having only a faint brown tinge beneath: mesothorax 
shining, with rather strong punctures, wanting in middle, 
Sparse near middle, more dense anteriorly; seutellum with 
