100 



GUIDE TO CALIFORNIA INSECTS. 



fraterna Sm. 

 stretchii Fox. 

 Pepsis chrysothemis Luc. 

 cinnabarina Luc. 

 formosa (Say.) 

 hesperiffi — mildei Stal. 

 sommeri Dahl. 



Planiceps planatus Fox. 

 Pompilius feiTugineus — Arachnoproc- 

 tonus. 



formosus — Pepsis. 



tenebrosus — Pycnopompilius. 

 Pycnopompilius tenebrosus (Cr.) 



FORM WIN A. 



FORMICID/E. 



The ants are of peculiar interest at the present time in California because 

 of the recent introduction and steady spread of the Argentine species, Irido- 

 myrex humilis, which is killing off all native ants and proving a very serious 

 annoyance about the house. Already the insect occupies all of Alameda and 

 the greater part of San Jose and College Park, and also large areas in Los 

 Angeles, Berkeley, and Stockton. It is present in numerous other localities. 



Ants are social insects with a wingless worker cast and queens that lose 

 their wings after their nuptual flight.. 



Literature: — California Bulletin 207. Wheeler, Ants. 



Aphenogaster paturellis Forel. 



pergandei Mayr. 

 Camponotus anthrax Whe. 



fallax Nyl. 



herculeanus Linn. 



hyatti Emery. 



lasvigatus Sm. 



tejonia Bick. 

 Iridomyrmex analis And. 



humilis Mayr. 

 Leptothorax andrei Emery. 



nitens Emery. 



pergandei And. 

 Liometopium apiculatum Mayr. 



microcephalum Panz. 

 Messor andrei Mayr. 

 pergandei And. 

 stodderdi Emery. 

 Monomorium ergatogyna— minutum 



minutum Mayr. 



pharionis Linn. 

 Myrmecocystis lugubris Whe. 



melliger Forel. 



mexicanus Wesm. 

 Fig-ure 75. Diagram of the venation »i j^yrmlca bicarinata. Nyl. 

 forrnicidpe. ■' , ,, ,■ \a/Uo 



Dradleyi Wne. 



maccooki Forel- 



maculatus Fabr. 

 Cremastogaster lineolata Say. 



vermiculata Emery. 

 Cyphomyrmex wheeleri Forel. 

 Dorymyrmex bicolor — pyramlcus. 



pyramicus Roger. 

 Echiton californicum Mayr. 

 Formica pilicornis Emery. 



rufa Linn. 



rufiventris Emery. 



subpolita Mayr. 



californicus Buck. 

 Phiedole barbarata Whe. 



californica Ma"- 



hyatti Emery. 

 Neoponera agilis For. 

 Pogonomyrmex badius Latr. 



barbatus Sm. 



californicus Buck. 



occidentalis Cr. 



subdentatus Mayr. 

 Plenolepis imparls Say. 

 Solenopsis aurea Whe. 



