This species is described from a population inhabiting nests of Progne subis hesperia in Sonora, Mexico. In laboratory studies it was found that first instar nymphs, fed once to repletion and then starved, molted and survived up to 63 days; that adults unfed after their final moult survived up to 169 days (males) or 218 days (females); and that a normally reproducing colony starved after approximately 75 days of age showed maximum survival for males of 59 days, for females 66 days. Well nourished virgin females were incapable of laying eggs, but after mating oviposited at the rate of 5.79 eggs per day per female for five consecutive weeks, with maximum production 6.88 eggs per day per female over a 3-day period. In one colony of 9 males and 14 females 5,195 eggs were produced over a 28-week period, an average of 343 per female, and 92.5% of these eggs hatched. Of 301 nymphs emerging to the adult stage, 37.9% were females, 62.1% males. Limited autogenous reproduction can occur in this species. In a colony where both sexes were not fed, 15 females produced 9 eggs; in another where only the females were unfed 13 females produced 25 eggs. Unfed males were found capable of inseminating females with viable sperm. 28 unfed males and 14 well fed females were kept together for one week, when the males were removed; these females averaged 242 eggs each during a 13-week period following exposure to the males, with maximum average production of 133 eggs for a 28- day period during the third to sixth weeks; 91.9% of these eggs hatched. Egg production declined sharply after eight weeks and virtually stopped by the 13th week, but when males were then added to the colony production increased to 0.9 egg per day per female. When starvation was imposed on a well-fed colony active in egg production, this production declined 92% between the fourth and seventh days, and only one egg was laid after the first week of starvation.