220 CALIFORNIA ACADEMY OF SCIENCES. 



One example from each of the above localities is all 

 that has been seen. The Pasadena specimen was taken 

 with ants in a large oak gall, in February, by Dr. 

 Fenyes; and the Redondo specimen was picked up by 

 Mr. Daggett on the beach in early spring. As indicated 

 in the description, L. angusta is readily distinguished 

 from both L. cava and L. montana by its small size and 

 narrow form. In both the former also the last antennal 

 joint is slightly but visibly shorter than the two pre- 

 ceding united, while in L. angusta it is slightly longer 

 than the two preceding. L. cava and L. montana resem- 

 ble each other much more closely, the size and form 

 being nearly the same. In L. cava the sides of the pro- 

 thorax are distinctly sinuate, the width being as great 

 in front of the sinuation as it is posteriorly; while in 

 L. montana the sides are not evidently sinuate, but 

 diverge to a point just before the hind angles. In L. 

 angusta the prothorax is widest at the hind angles. The 

 intermediate joints of the antennae in L. cava are decid- 

 edly more elongate than in L. montana or L. angusta. 



18. Heterothops carbonatus, sp. nov. 



This species agrees tolerably well with Horn's description of H. fumi- 

 gatus, except in the following particulars: Average size a little smaller; 

 color deep black throughout except the legs, which may be more or less 

 piceous; head more broadly oval, eyes much larger, distant about half their 

 length from the nuchal constriction; last ventral of male less deeply 

 emarginate. 



Length, 3-3.5 mm. 



Common along the margins of streams and in the 

 vegetable mould which accumulates in damp situations 

 throughout maritime Southern California. 



While the color seems to be a perfectly reliable means 

 of separation, the much larger eyes will in any event at 

 once distinguish H. carbonatus from H. fumigatus; in 



